Posted by **Neil** on Thursday, June 7, 2012 at 5:11pm.

1.Let f(x)= x^2 - 5 and g(x)= 3x^2. Find g(f(x)).

2. Let f(x)= x^2 - 4 and g(x) -3x^2. Find f(g(x)).

- Math -
**lindsay**, Thursday, June 7, 2012 at 6:43pm
g(x)= -3x^2

g(f(x))= -3(x^2-4)^2

-6(x^2-4)(2x)

-6x^2-24 (2x)

-12x^3-48x

-12x(x^2+4)

f(g(x))= (-3x^2)^2-4

2(-3x^2)(-6x)-4

-6x^2(-6x)-4

36x^3-4

4(9x^3-1)

- Math -
**Neil**, Thursday, June 7, 2012 at 8:04pm
I think you're doing it wrong, because I am not getting those answers. I got answer choices.

- Math -
**Ms. Sue**, Thursday, June 7, 2012 at 8:19pm
Neil -- for heaven's sakes! If you have answer choices, please post them along with your problem!

- Math -
**Neil**, Thursday, June 7, 2012 at 10:16pm
1. Let f(x)= x^2 - 5 and g(x)= 3x^2. Find g(f(x)).

A. 3x^4 - 30x^2 + 75

B. -3x^4 - 15

C. 9x^4

D. -3x^4 - 4

2. Let f(x)= x^2 - 4 and g(x)= -3x^2. Find f(g(x)).

F. -3x^4 + 12

G. -3x^4 + 24x^2 - 48

H. 9x^4 - 4

I. -3x^4 - 4

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