Let P(x)=2x 4 - 7x 3 + x2 - 18x +3.(a) Use Descartes’ Rule of Signs to determine how many positive and how many negativereal zeros P can have.(b) Show that 4 is an upper bound and -1 is a lower bound for the real zeros of P.(c) Draw a graph of P, and use it to estimate the real zeros of P, rounded to two decimalplaces.(d) Find the coordinates of all local extrema of P, rounded to two decimals.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.4: Complex And Rational Zeros Of Polynomials
Problem 18E
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Let P(x)=2x 4 - 7x 3 + x2 - 18x +3.
(a) Use Descartes’ Rule of Signs to determine how many positive and how many negative
real zeros P can have.
(b) Show that 4 is an upper bound and -1 is a lower bound for the real zeros of P.
(c) Draw a graph of P, and use it to estimate the real zeros of P, rounded to two decimal
places.
(d) Find the coordinates of all local extrema of P, rounded to two decimals.

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