Find and simplify the expression if f(x) = x^2−10.

Question

Find and simplify the expression if f(x) = x^2−10.

​f(2​x) = ______

Answer 1

Just plug "2x" in where the function has "x".

f(2x) = (2x)² - 10 (You must square the whole expression (2x), not only the x.)

(2x)² = 4x²

f(2x) = 4x² - 10

No further simplification is possible. The answer can be factored though.