Question

If f(x)=x^2-2x, find: f(5)=?

Answer 1

15

Explanation:

Since x was replaced by 5, f(x); f(5), we want to replace all the x's with 5's:

f(x) = x^2-2x

f(5) = 5^2-2(5)

= 25 - 10

= 15

You just have to replace x and simplify.