Question

If f(x) = 2x² - 5, f(5) =

Answer 1

45

Explanation:

Put in '5' where 'x' is

2 (5)^2 - 5 = 45

Answer 2

What is the equation:
`2x^2-5`

What do we want to find: f(5)

To find f(5), we must plug the value '5'

⇒ into the 'x' position

⇒ f(x)

So:
`f(5) = 2(5^2)-5 = 2 * 25 - 5 = 50 -5 = 45`

Thus f(5) = 45

Hope that helps!