Please, could someone please explain them. I understand that if you need to find f(g(x)) then you should replace g(x) with f(x), but I dont understand how to do that!
Let's say its this:
Find f(g(x))
f(x)=5x+4 g(x) = 4-x
Can someone explain how to do this, and when you replace g(x) with f(x), why do you get rid of the x in the f(x)?
2007-09-21 14:38:04 · 7 answers · asked by taekwondobabe30 2 in Science & Mathematics ➔ Mathematics
substitute the 4-x in the f(x)
so f(x)=5(4-x)+4
= 20-5x+4
=24-5x
2007-09-21 14:42:50 · answer #1 · answered by h b 4 · 0⤊ 0⤋
One is composed inside the other. Since g is inside f, then the function is also. f(g(x)) = 5(4-x)+4 = 20 -5x +4 = -5x+24. Just put the inside function everywhere there is an x.
2007-09-22 00:21:25 · answer #2 · answered by james w 5 · 0⤊ 0⤋
Just follow the bouncing ball. Remember that x is a number, but so is g(x). So to find f(g(x)), replace x in f(x) by g(x). Then f(g(x))=5*(4-x) +4=
24-5x
2007-09-21 21:47:27 · answer #3 · answered by cattbarf 7 · 0⤊ 0⤋
Given
f(x) = 5x + 4
g(x) = 4 - x
Find f(g(x)).
f(g(x)) = f(4 - x) = 5(4 - x) + 4 = 20 - 5x + 4 = 24 - 5x
2007-09-21 21:48:24 · answer #4 · answered by Northstar 7 · 0⤊ 0⤋
f(x)=5x+4 g(x) = 4-x
f(g(x))=5(4-x)+4=20-5x+4=24-5x
2007-09-21 21:44:10 · answer #5 · answered by ptolemy862000 4 · 0⤊ 0⤋
Find f(g(x))
f(x)=5x+4 g(x) = 4-x
fg(x) = 5(4 - x) + 4
That's the answer, it's best if you can see how it works by example imo.
2007-09-21 21:43:08 · answer #6 · answered by Matthew H 2 · 0⤊ 0⤋
f(g(x))
=f(4x)
=5(4x)+4
=20x+4
2007-09-21 21:47:11 · answer #7 · answered by kathir 1 · 0⤊ 1⤋