Multiplying function

[dragonmaster0121]

How would I multipy f(x) by g(x), if f(x)=9x-7 and g(x)=x^2?
would it be:
f(g(x))=9x-7(x^2) or f(g(x))=(9x-7)(x^2)?
Am I totally wrong?
Because, most problems are not commutative I read so it probably shouldn't have parenthesis?

 

[soroban]

Hello, dragonmaster0121!

How would I multipy f(x) by g(x), if f(x)=9x-7 and g(x)=x^2?

Simple algebra . . . Have you forgotten your Algebra I already?

. . . f(x)·g(x) . = . (9x - 7)(x²) . = . 9x³ - 7x²


But then you ask:

would it be: f(g(x)) or f(g(x))?

And it looks like you're dealing with composite functions.
If you are, you need to do some serious reviewing . . .