solve these Function Notation

Question

f(x)=x²−x

f(5)=

f(x)=x²+x

f(-2)

Answer 1

I promise these are way easier than you think. Plug what's inside the parentheses for what's inside the parentheses.

f(x) = x² - x

f(5) = 5² - 5

f(5) = 25 - 5

f(5) = 20

f(x) = x² + x

f(-2) = (-2)² + (-2)

f(-2) = 4 - 2

f(-2) = 2

Hope this helps!