Question

Two questions below:

Determine the following if f(x)=2x^2+5:
f(3x)
and
-f(x)

Answer 1

substitute 3x in place of x

2(3x)^2 +5
=18x^2+5

Answer 2

for the second one,

Just negate the whole thing,
-2x^2-5

Answer 3

That looked easy, thanks.

Answer 4

help me: http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4ddc0788a7af8b0b29a97c7a