Question

Identify f(x) and g(x) from equation, if each is in the form of f(g(x))
5(2x+3)^3-9(2x+3)

Answer 1

So it is kinda like this!
f(x) would be = 5x^3 - 9x
Whereas g(x) = 2x+3
It is self evident from the question!
It is because f(g(x)) will have the value of x substituted by g(x)
Getting me? :)

Answer 2

somewhat..u lost me at f(g(x)) will have the value of x substituted by g(x)

Answer 3

f(x) means that their is a variable with x!
That is it is a FUNCTION OF x
But in this case they want us to find f(g(x))
So that would mean that whatever g(x) is, has been written in place of x in f(x)
so here g(x) = 2x + 3 has been written in place of all the x's in f(x)
Which should be f(x) = 5x^3 - 9x
Getting me? :D

Answer 4

ohhh ok. I get u now. A big fat thank u to u :)

Answer 5

:)