To find: the year which did the population first reach 722000.
Answer to Problem 43E
After 68 years from 1890 or in year 1958, the population first reaches 722000
Explanation of Solution
Given information:
1890 to 2000, the A.I, E, and A population
Calculation:
Substituting
Because negative real roots and imaginary roots doesn’t make sense, so need to check for only positive real root.
By the Descartes’s rule, the equation has one positive real root.
Input
The display is shown below:
Press The GRAPH key.
To find the zero, press
From the above display, the function has one zero at approximately
Therefore, after 68 years from 1890 or in year 1958, the population first reach 722000.
Chapter 4 Solutions
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