Algebra 2
Algebra 2
1st Edition
ISBN: 9780078884825
Author: McGraw-Hill/Glencoe
Publisher: Glencoe/McGraw-Hill School Pub Co
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Chapter 6.8, Problem 33PPS
To determine

To calculate: The zeros of the function f(x)=6x4+22x3+11x238x40 .

Expert Solution & Answer
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Answer to Problem 33PPS

The zeros of the function f(x)=6x4+22x3+11x238x40 are 2 ,43,3+i2  and 3i2 .

Explanation of Solution

Given information:

The function f(x)=6x4+22x3+11x238x40 .

Formula used:

A polynomial of n degree has n zeros, which can be either real or imaginary.

Descartes’ rule of signs states that consider a polynomial P(x)=anxn++a1x+a0 with real coefficients then, the number of times the sign between coefficients changes is equal to count of positive real zeroes of P(x) or is less than this by an even number, the number of times the sign between coefficients changes is equal to count of negative real zeroes of P(x) or is less than this by an even number.

Calculation:

Consider the function f(x)=6x4+22x3+11x238x40 .

Observe that degree of polynomial is 4, so the functions has 4 zeros which can be either real or imaginary.

Descartes’ rule of signs states that consider a polynomial P(x)=anxn++a1x+a0 with real coefficients then, the number of times the sign between coefficients changes is equal to count of positive real zeroes of P(x) or is less than this by an even number.

So, count the number of times the sign changes between the coefficients of f(x)=6x4+22x3+11x238x40

There is 1 positive real zero.

Now,

  f(x)=6x422x3+11x2+38x40

Descartes’ rule of signs states that consider a polynomial P(x)=anxn++a1x+a0 with real coefficients then, the number of times the sign between coefficients changes is equal to count of negative real zeroes of P(x) or is less than this by an even number.

So, count the number of times the sign changes between the coefficients of f(x)=6x422x3+11x2+38x40 .

There are 3 or 1 negative real zeros.

Next, construct a table with possible combinations of real and imaginary zeros.

  Number of PositiveReal zerosNumber of NegativeReal zerosNumber ofImaginary zerosTotal Numberof zeros1301+3+0=41121+1+2=4

Recall that the Rational zero theorem states that provided a polynomial P(x) with integral coefficients then every rational zero is of the form pq that is a rational number in simplest form. Here, p is a factor of the constant term and q is a factor of leading coefficient.

For the provided function leading coefficient is 6 and constant term is 40 Therefore, p is a factor of 40 and q is a factor of 6.

The possible combinations of pq in simplest form are,

  pq=±1,±2,±4,±5,±8,±10,±20,±40,±12,±52,±13,±23,±43,±53,±83,±103,±203,±403,±16,±56

Next, construct a table with help of synthetic substitution to compute the value of f(x) for real values of x .

  x62211384016283913916165337263479120200261092001262524741058425812619234155816584361017100436143239250278027

As observed two zeros are resulted at x=2 and x=43 . One of the factors of the polynomial is

  (x+2)(3x4)=3x2+2x8

Now, divide the polynomial f(x)=6x4+22x3+11x238x40 by (3x2+2x8) to obtain remaining factors.

  3x2+2x82x2+6x+56x4+22x3+11x238x406x44x3+16x218x3+27x238x18x312x2+48x15x2+10x4015x210x+400

Now, the depressed polynomial is obtained is 2x2+6x+5 .

Factor the polynomial.

  x=b±b24ac2ax=6±624(2)(5)2(2)x=6±44x=6±2i4

Either x=6+2i4 or x=62i4

That is, x=3+i2 or x=3i2 .

Thus, the zeros of the function f(x)=6x4+22x3+11x238x40 are 2 ,43,3+i2  and 3i2 .

Chapter 6 Solutions

Algebra 2

Ch. 6.1 - Prob. 5CYPCh. 6.1 - Prob. 6ACYPCh. 6.1 - Prob. 6BCYPCh. 6.1 - Prob. 1CYUCh. 6.1 - Prob. 2CYUCh. 6.1 - Prob. 3CYUCh. 6.1 - Prob. 4CYUCh. 6.1 - Prob. 5CYUCh. 6.1 - Prob. 6CYUCh. 6.1 - Prob. 7CYUCh. 6.1 - Prob. 8CYUCh. 6.1 - Prob. 9CYUCh. 6.1 - Prob. 10CYUCh. 6.1 - Prob. 11CYUCh. 6.1 - Prob. 12CYUCh. 6.1 - Prob. 13CYUCh. 6.1 - Prob. 14CYUCh. 6.1 - Prob. 15CYUCh. 6.1 - Prob. 16PPSCh. 6.1 - Prob. 17PPSCh. 6.1 - Prob. 18PPSCh. 6.1 - Prob. 19PPSCh. 6.1 - Prob. 20PPSCh. 6.1 - Prob. 21PPSCh. 6.1 - Prob. 22PPSCh. 6.1 - Prob. 23PPSCh. 6.1 - Prob. 24PPSCh. 6.1 - Prob. 25PPSCh. 6.1 - Prob. 26PPSCh. 6.1 - Prob. 27PPSCh. 6.1 - Prob. 28PPSCh. 6.1 - Prob. 29PPSCh. 6.1 - Prob. 30PPSCh. 6.1 - Prob. 31PPSCh. 6.1 - Prob. 32PPSCh. 6.1 - Prob. 33PPSCh. 6.1 - Prob. 34PPSCh. 6.1 - Prob. 35PPSCh. 6.1 - Prob. 36PPSCh. 6.1 - Prob. 37PPSCh. 6.1 - Prob. 38PPSCh. 6.1 - Prob. 39PPSCh. 6.1 - Prob. 40PPSCh. 6.1 - Prob. 41PPSCh. 6.1 - Prob. 42PPSCh. 6.1 - Prob. 43PPSCh. 6.1 - Prob. 44PPSCh. 6.1 - Prob. 45PPSCh. 6.1 - 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Prob. 43HPCh. 6.6 - Prob. 44HPCh. 6.6 - Prob. 45HPCh. 6.6 - Prob. 46HPCh. 6.6 - Prob. 47HPCh. 6.6 - Prob. 48STPCh. 6.6 - Prob. 49STPCh. 6.6 - Prob. 50STPCh. 6.6 - Prob. 51STPCh. 6.6 - Prob. 52STPCh. 6.6 - Prob. 53STPCh. 6.6 - Prob. 54STPCh. 6.6 - Prob. 55STPCh. 6.6 - Prob. 56STPCh. 6.6 - Prob. 57STPCh. 6.6 - Prob. 58SCh. 6.6 - Prob. 59SCh. 6.6 - Prob. 60SCh. 6.6 - Prob. 61SCh. 6.6 - Prob. 62SCh. 6.6 - Prob. 63SCh. 6.7 - Prob. 1ACYPCh. 6.7 - Prob. 1BCYPCh. 6.7 - Prob. 1CCYPCh. 6.7 - Prob. 1DCYPCh. 6.7 - Prob. 2CYPCh. 6.7 - Prob. 3CYPCh. 6.7 - Prob. 4CYPCh. 6.7 - Prob. 1CYUCh. 6.7 - Prob. 2CYUCh. 6.7 - Prob. 3CYUCh. 6.7 - Prob. 4CYUCh. 6.7 - Prob. 5CYUCh. 6.7 - Prob. 6CYUCh. 6.7 - Prob. 7CYUCh. 6.7 - Prob. 8CYUCh. 6.7 - Prob. 9CYUCh. 6.7 - Prob. 10CYUCh. 6.7 - Prob. 11CYUCh. 6.7 - Prob. 12CYUCh. 6.7 - Prob. 13CYUCh. 6.7 - Prob. 14CYUCh. 6.7 - Prob. 15CYUCh. 6.7 - Prob. 16CYUCh. 6.7 - Prob. 17PPSCh. 6.7 - Prob. 18PPSCh. 6.7 - Prob. 19PPSCh. 6.7 - Prob. 20PPSCh. 6.7 - Prob. 21PPSCh. 6.7 - Prob. 22PPSCh. 6.7 - Prob. 23PPSCh. 6.7 - Prob. 24PPSCh. 6.7 - Prob. 25PPSCh. 6.7 - Prob. 26PPSCh. 6.7 - Prob. 27PPSCh. 6.7 - Prob. 28PPSCh. 6.7 - Prob. 29PPSCh. 6.7 - Prob. 30PPSCh. 6.7 - Prob. 31PPSCh. 6.7 - Prob. 32PPSCh. 6.7 - Prob. 33PPSCh. 6.7 - Prob. 34PPSCh. 6.7 - Prob. 35PPSCh. 6.7 - Prob. 36PPSCh. 6.7 - Prob. 37PPSCh. 6.7 - Prob. 38PPSCh. 6.7 - Prob. 39PPSCh. 6.7 - Prob. 40PPSCh. 6.7 - Prob. 41PPSCh. 6.7 - Prob. 42PPSCh. 6.7 - Prob. 43PPSCh. 6.7 - Prob. 44PPSCh. 6.7 - Prob. 45PPSCh. 6.7 - Prob. 46PPSCh. 6.7 - Prob. 47PPSCh. 6.7 - Prob. 48PPSCh. 6.7 - Prob. 49PPSCh. 6.7 - Prob. 50PPSCh. 6.7 - Prob. 51PPSCh. 6.7 - Prob. 52PPSCh. 6.7 - Prob. 53PPSCh. 6.7 - Prob. 54PPSCh. 6.7 - Prob. 55PPSCh. 6.7 - Prob. 56HPCh. 6.7 - Prob. 57HPCh. 6.7 - Prob. 58HPCh. 6.7 - Prob. 59HPCh. 6.7 - Prob. 60HPCh. 6.7 - Prob. 61HPCh. 6.7 - Prob. 62HPCh. 6.7 - Prob. 63HPCh. 6.7 - Prob. 64HPCh. 6.7 - Prob. 65STPCh. 6.7 - Prob. 66STPCh. 6.7 - Prob. 67STPCh. 6.7 - Prob. 68STPCh. 6.7 - Prob. 69STPCh. 6.7 - Prob. 70STPCh. 6.7 - Prob. 71STPCh. 6.7 - Prob. 72STPCh. 6.7 - Prob. 73STPCh. 6.7 - Prob. 74SCh. 6.7 - Prob. 75SCh. 6.7 - Prob. 76SCh. 6.8 - Prob. 1ACYPCh. 6.8 - Prob. 1BCYPCh. 6.8 - Prob. 2CYPCh. 6.8 - Prob. 3ACYPCh. 6.8 - Prob. 3BCYPCh. 6.8 - Prob. 1CYUCh. 6.8 - Prob. 2CYUCh. 6.8 - Prob. 3CYUCh. 6.8 - Prob. 4CYUCh. 6.8 - Prob. 5CYUCh. 6.8 - Prob. 6CYUCh. 6.8 - Prob. 7CYUCh. 6.8 - Prob. 8CYUCh. 6.8 - Prob. 9CYUCh. 6.8 - Prob. 10PPSCh. 6.8 - Prob. 11PPSCh. 6.8 - Prob. 12PPSCh. 6.8 - Prob. 13PPSCh. 6.8 - Prob. 14PPSCh. 6.8 - Prob. 15PPSCh. 6.8 - Prob. 16PPSCh. 6.8 - Prob. 17PPSCh. 6.8 - Prob. 18PPSCh. 6.8 - Prob. 19PPSCh. 6.8 - Prob. 20PPSCh. 6.8 - Prob. 21PPSCh. 6.8 - Prob. 22PPSCh. 6.8 - Prob. 23PPSCh. 6.8 - Prob. 24PPSCh. 6.8 - Prob. 25PPSCh. 6.8 - Prob. 26PPSCh. 6.8 - Prob. 27PPSCh. 6.8 - Prob. 28PPSCh. 6.8 - Prob. 29PPSCh. 6.8 - Prob. 30PPSCh. 6.8 - Prob. 31PPSCh. 6.8 - Prob. 32PPSCh. 6.8 - Prob. 33PPSCh. 6.8 - Prob. 34PPSCh. 6.8 - Prob. 35PPSCh. 6.8 - Prob. 36PPSCh. 6.8 - Prob. 37PPSCh. 6.8 - Prob. 38PPSCh. 6.8 - Prob. 39PPSCh. 6.8 - Prob. 40PPSCh. 6.8 - Prob. 41PPSCh. 6.8 - Prob. 42PPSCh. 6.8 - Prob. 43PPSCh. 6.8 - Prob. 44PPSCh. 6.8 - Prob. 45PPSCh. 6.8 - Prob. 46HPCh. 6.8 - Prob. 47HPCh. 6.8 - Prob. 48HPCh. 6.8 - Prob. 49HPCh. 6.8 - Prob. 50HPCh. 6.8 - Prob. 51HPCh. 6.8 - Prob. 52HPCh. 6.8 - Prob. 53HPCh. 6.8 - Prob. 54HPCh. 6.8 - Prob. 55HPCh. 6.8 - Prob. 56STPCh. 6.8 - Prob. 57STPCh. 6.8 - Prob. 58STPCh. 6.8 - Prob. 59STPCh. 6.8 - Prob. 60STPCh. 6.8 - Prob. 61STPCh. 6.8 - Prob. 62STPCh. 6.8 - Prob. 63STPCh. 6.8 - Prob. 64SCh. 6.8 - Prob. 65SCh. 6.8 - Prob. 66SCh. 6.8 - Prob. 67SCh. 6.8 - Prob. 68SCh. 6.8 - Prob. 69SCh. 6.8 - Prob. 1SGRCh. 6.8 - Prob. 2SGRCh. 6.8 - Prob. 3SGRCh. 6.8 - Prob. 4SGRCh. 6.8 - Prob. 5SGRCh. 6.8 - Prob. 6SGRCh. 6.8 - Prob. 7SGRCh. 6.8 - Prob. 8SGRCh. 6.8 - Prob. 9SGRCh. 6.8 - Prob. 10SGRCh. 6.8 - Prob. 11SGRCh. 6.8 - Prob. 12SGRCh. 6.8 - Prob. 13SGRCh. 6.8 - Prob. 14SGRCh. 6.8 - Prob. 15SGRCh. 6.8 - Prob. 16SGRCh. 6.8 - Prob. 17SGRCh. 6.8 - Prob. 18SGRCh. 6.8 - Prob. 19SGRCh. 6.8 - Prob. 20SGRCh. 6.8 - Prob. 21SGRCh. 6.8 - Prob. 22SGRCh. 6.8 - Prob. 23SGRCh. 6.8 - Prob. 24SGRCh. 6.8 - Prob. 25SGRCh. 6.8 - Prob. 26SGRCh. 6.8 - Prob. 27SGRCh. 6.8 - Prob. 28SGRCh. 6.8 - Prob. 29SGRCh. 6.8 - Prob. 30SGRCh. 6.8 - Prob. 31SGRCh. 6.8 - Prob. 32SGRCh. 6.8 - Prob. 33SGRCh. 6.8 - Prob. 34SGRCh. 6.8 - Prob. 35SGRCh. 6.8 - Prob. 36SGRCh. 6.8 - Prob. 37SGRCh. 6.8 - Prob. 38SGRCh. 6.8 - Prob. 39SGRCh. 6.8 - Prob. 40SGRCh. 6.8 - Prob. 41SGRCh. 6.8 - Prob. 42SGRCh. 6.8 - Prob. 43SGRCh. 6.8 - Prob. 44SGRCh. 6.8 - Prob. 45SGRCh. 6.8 - Prob. 46SGRCh. 6.8 - Prob. 47SGRCh. 6.8 - Prob. 48SGRCh. 6.8 - Prob. 49SGRCh. 6.8 - Prob. 50SGRCh. 6.8 - Prob. 51SGRCh. 6.8 - Prob. 52SGRCh. 6.8 - Prob. 53SGRCh. 6.8 - Prob. 54SGRCh. 6.8 - Prob. 55SGRCh. 6.8 - Prob. 56SGRCh. 6.8 - Prob. 1PTCh. 6.8 - Prob. 2PTCh. 6.8 - Prob. 3PTCh. 6.8 - Prob. 4PTCh. 6.8 - Prob. 5PTCh. 6.8 - Prob. 6PTCh. 6.8 - Prob. 7PTCh. 6.8 - Prob. 8PTCh. 6.8 - Prob. 9PTCh. 6.8 - Prob. 10PTCh. 6.8 - Prob. 11PTCh. 6.8 - Prob. 12PTCh. 6.8 - Prob. 13PTCh. 6.8 - Prob. 14PTCh. 6.8 - Prob. 15PTCh. 6.8 - Prob. 16PTCh. 6.8 - Prob. 17PTCh. 6.8 - Prob. 18PTCh. 6.8 - Prob. 19PTCh. 6.8 - Prob. 20PTCh. 6.8 - Prob. 21PTCh. 6.8 - Prob. 22PTCh. 6.8 - Prob. 23PTCh. 6.8 - Prob. 24PTCh. 6.8 - Prob. 25PTCh. 6.8 - Prob. 1ECh. 6.8 - Prob. 2ECh. 6.8 - Prob. 1STPCh. 6.8 - Prob. 2STPCh. 6.8 - Prob. 3STPCh. 6.8 - Prob. 4STPCh. 6.8 - Prob. 5STPCh. 6.8 - Prob. 6STPCh. 6.8 - Prob. 7STPCh. 6.8 - Prob. 8STPCh. 6.8 - Prob. 9STPCh. 6.8 - Prob. 10STPCh. 6.8 - Prob. 11STPCh. 6.8 - Prob. 12STPCh. 6.8 - Prob. 13STPCh. 6.8 - Prob. 14STPCh. 6.8 - Prob. 15STPCh. 6.8 - Prob. 16STPCh. 6.8 - Prob. 17STPCh. 6 - Prob. 1QCCh. 6 - Prob. 2QCCh. 6 - Prob. 3QCCh. 6 - Prob. 4QCCh. 6 - Prob. 5QCCh. 6 - Prob. 6QCCh. 6 - Prob. 7QCCh. 6 - Prob. 8QCCh. 6 - Prob. 9QCCh. 6 - Prob. 10QCCh. 6 - Prob. 11QCCh. 6 - Prob. 12QCCh. 6 - Prob. 13QCCh. 6 - Prob. 14QCCh. 6 - Prob. 15QCCh. 6 - Prob. 1MCQCh. 6 - Prob. 2MCQCh. 6 - Prob. 3MCQCh. 6 - Prob. 4MCQCh. 6 - Prob. 5MCQCh. 6 - Prob. 6MCQCh. 6 - Prob. 7MCQCh. 6 - Prob. 8MCQCh. 6 - Prob. 9MCQCh. 6 - Prob. 10MCQCh. 6 - Prob. 11MCQCh. 6 - Prob. 12MCQCh. 6 - Prob. 13MCQCh. 6 - Prob. 14MCQCh. 6 - Prob. 15MCQCh. 6 - Prob. 16MCQCh. 6 - Prob. 17MCQCh. 6 - Prob. 18MCQCh. 6 - Prob. 19MCQCh. 6 - Prob. 20MCQCh. 6 - Prob. 21MCQ
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