Question

The functions f and g are defined as followed.

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

Find f(-5) and G(-3)

Answer 1

for f(-5) Substitute -5 in place of x in the equation of f(x) and for g(-3) substitute -3 in place of x in g(x)

Answer 2

f(-5) = -15 + 4 = -11

g(-3) = -3 (- 3)^3 -2 = -81 -2 = -83

Answer 3

@ganibl when I worked out the second one with g I got 79, did I do my exponent wrong?

Answer 4

No U got it right :) I did wrong :)

Answer 5

-3 (-27) - 2 = 81 - 2 = 79

Answer 6

Okay will you check this one for me? I'm pretty sure I got the second one rights I just want to make sure on the first one @ganibl f(x)=4x^2-x and g(x)=-4x+4 f(-3) G(4)

For the first one I got 141 and for the second one I got -12

Answer 7

f(-3) = 4(-3)^2 - (-3) = 4*9 + 3 = 36 + 3 = 39
g(4) = -4(4) + 4 = -16 + 4 = -12

Answer 8

@ganibl oh okay I see what I did, thank you so much :)