Question

ASAP please!
let f(x)=9x^2-2. Find f(a^2)

Answer 1

what's a?

Answer 2

just substitute x with a^2

Answer 3

if a=x,than it's 9a^4-2

Answer 4

\[f(a^{2})= 9(a^{2})^{2}-2\]

Answer 5

so what is the answer?

Answer 6

\[f(a^{2})= 9a^{4}-2\]

Answer 7

thank you :D