Question

F(x)=−x
2
−8, find f, left bracket, 4, right bracketf(4)

Answer 1

f(4) = - 24

Explanation:

to evaluate f(4) , substitute x = 4 into f(x)

f(x) = - x² - 8 , then

f(4) = - 4² - 8 = - 16 - 8 = - 24

Answer 2

f(4) = -4

Explanation:

The question is unclear:

f(x)=−x

2

−8

This assumes it is f(x) = -x

The equation f(x) = -x is telling us that for any value of x, the function, f, will return a value of -x.

When we see f(4), it means that x is 4 in the function f(x). If f(x) = -x, then f(4) = -4