Question

given the function $f(x) = -5x^2 - x + 20$, find $f(3)$. -13 64 62 -28

Explanation:

Step1: Substitute \( x = 3 \) into the function \( f(x)=-5x^{2}-x + 20 \)

\( f(3)=-5\times(3)^{2}-3 + 20 \)

Step2: Calculate the power term

First, calculate \( (3)^{2}=9 \), so the expression becomes \( f(3)=-5\times9-3 + 20 \)

Step3: Calculate the multiplication

\( -5\times9=-45 \), then the expression is \( f(3)=-45-3 + 20 \)

Step4: Calculate the addition and subtraction

First, \( -45-3=-48 \), then \( -48 + 20=-28 \)

Answer:

\(-28\) (corresponding to the option with \(-28\))