Question

Find the value of f(-2) for the function f\left(x\right)=5x^2-4

Answer 1

f(- 2) = 16

Explanation:

Substitute x = - 2 into f(x), that is

f(- 2) = 5(- 2)² - 4 = 5(4) - 4 = 20 - 4 = 16

Answer 2

16

Explanation:

Since f(x) is 5x^2-4

And f(2) is given it means we will have to substitute the value for x

So we have

5(2)^2-4

5(4)-4

20-4

16

Therefore f(2) is 16