Chapter 5.1, Problem 1AYU

Find $f\left(3\right)$ if $f\left(x\right)=-4x^2+5x$. (pp. 60-62)

To determine

To find: $f\left(3\right)$ if $f\left(x\right)=-4x^2+5x$.

Answer to Problem 1AYU

Solution:

$f\left(3\right)=-21$

Explanation of Solution

Given:

$f\left(x\right)=-4x^2+5x$

Calculation:

Replace $x$ by 3 in the function, we get the solution as

$f\left(3\right)=-4{\left(3\right)}^2+5\left(3\right)$

$f\left(3\right)=-36+15$

$f\left(3\right)=-21$