Question

Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f ° g)(-5).

Answer 1

can you find g(-5) = ????

Answer 2

after you find g(-5), put that answer into f...

Answer 3

I'm a little lost, so pretty much just do this, -2*(-5) -7 and -4*(-5) + 3? Is that what your saying?

Answer 4

yes... but i only wanted g(-5)... so g(-5) = -4*(-5) + 3 = ????

what's the answer here?

Answer 5

23

Answer 6

good... now that you found g(-5)=23, that 23 goes into f. so you need to find f(23) = ???

Answer 7

It would be -53 wouldnt it?

Answer 8

that is the definition of (f ° g)(-5) = f(g(-5))

Answer 9

yes.... :)
f(23) = -2*(23) - 7 = -46 -7 = -53

Answer 10

good work... :)

Answer 11

Thanks for your help.! =)

Answer 12

yw...:)