# Math Help - f(x) question!!

1. ## f(x) question!!

The question is, Given f(x)= x(x-3), find f(x-10)

I tried to do it and the answer i got is

x^2 -3x +70

Just want to know if my answer is correct? Thanks

2. Originally Posted by fvaras89
The question is, Given f(x)= x(x-3), find f(x-10)

I tried to do it and the answer i got is

x^2 -3x +70

Just want to know if my answer is correct? Thanks

$f(x)=x(x-3)$

$f(x-10)=(x-10)(x-10-3)$

$=(x-10)(x-13)$

$=x^2-13x-10x+130$

$
=x^2-23x+130
$