Question

the function h is defined by h(x)=3x^2-2.
Find h(5z)

Answer 1

simply plug in x=5z

so it will be

3(5z)^2-2
=3*25z^2-2=75z^2-2

Answer 2

Thank you. And what about h(x)=3x^2+2x
h(4x)

Answer 3

Would I just do 3(4x)^2+2(4x)?

Answer 4

yes exactly...

Answer 5

So i would get 12x^2+8x

Answer 6

no...4^2=16

so 16*3=48x^2+8x

Answer 7

lousy mistake...THANK YOU SO MUCH