Question

If `f(x)=x^2-x`, how do you find `f(2x)`?

Answer 1

`4x^2-2x`

Explanation:

All that is required here is to substitute x = 2x into the right side in the same way that is done for a numeric value.

`f(x)=x^2-x`

f(2) means substitute x = 2

`rArrf(2)=2^2-2=4-2=2`

In the same way:

`f(2x)=(2x)^2-(2x)=4x^2-2x`