Question

The function
f is defined by f(x)=2x^2 -1
.
Find
f(4x).
I'm really having trouble understanding what this question wants. I got 32x^2 -1 but I don't think i did it right.

Answer 1

replace x with (4x)
\(f(4x)=2(4x)^2-1=2*16x^2-1=32x^2-1\)

you did it right

Answer 2

okay. Thank you. I just wasn't sure if i replace it with 4 or 4x. Thank you! If I need more help can I tag you?

Answer 3

sure

Answer 4

Thank you. Every time I post questions no one helps, this site has failed me so many times.

Answer 5

I'll close the question now.

Answer 6

it depends on a lot of stuff, name time of day, and what day it is.
on weekends/fridays nobody's really on

Answer 7

alright

Answer 8

namely*