Question

f(x) = 3x + 5, g(x) = 6x2

Find (fg)(x).

Answer 1

both fg and fg(x) signify the PRODUCT of functions f and g.

Enclose both the right side of your definition of f(x) and that of your definition of g(x) in parentheses and then multiply those two quantities together.

Answer 2

fg(x) = ( ? )( ? ) = ??

Answer 3

I hope that giving a similar example, would help you with your problem.

\(\large\color{blue}{ \rm f(x)=2x+1}\)
\(\large\color{blue}{ \rm g(x)=3x-3}\)

\(\large\color{blue}{ \rm (fg)(x)=(2x+1)(3x-3)=6x^2-3x-3.}\)

Answer 4

Thank you:)

Answer 5

6x2 + 3x + 5, right?

Answer 6

@solomonzelman": That's a very nice (and effective) way of helping someone else. Thanks.