Question

Given that f(x) = x2 − 4x − 3 and g(x) =(x+3)/4, solve for f(g(x)) when x = 9.

i know i have to plug the 9 in and i did for f(x) i got 42 and for g(x) i got 3 i just don't know what to do after that.

Answer 1

you dont need to do f(x). You need to find g(x). You said you got 3. so now you need to do f(3)

Answer 2

so it would be f(3)= 3^2-4(3)-3?

Answer 3

Yep

Answer 4

i got -9

Answer 5

but the only thing closest to that is just 9 is that correct?

Answer 6

@naturefeelsx You forgot that the 'x' inside f(x) is a modulus. Its |x|=|-9|=9

Answer 7

so yes its Positive 9 and not negative -9

Answer 8

alrighty thank you so much for your help! @mrgenius

Answer 9

my pleasure!