Question

Let f(x) = 2x - 6 and g(x) = -3x - 7. Find (f(g))(3). I got 2 different answers, 26 and -38, i am not sure which one is right...

Answer 1

find g(3) first

g(3) = -3(3) - 7
g(3) = -9 - 7
g(3) = -16

sub this to every x in f(x)

2(-16) - 6
-32 - 6
-38 is the answer

Answer 2

do you get how i did it?

Answer 3

f(g(x))(3) = f(g(3))

Answer 4

yes! i get it, my mistake was positive 32 instead of -32. Thanks!

Answer 5

Find S10 for 1 + 4 + 7 +