Question

Help with a problem again please

Answer 1

Answer:

$\huge\boxed{Option \ 3 : (fg)(x) = 9x^3+27x^2}$

Step-by-step explanation:

$f(x) = 3x+9\\g(x) = 3x^2$

Multiplying both

$(fg)(x) = (3x+9)(3x^2)\\(fg)(x) = 9x^3+27x^2$

Answer 2

Answer:

9x³ + 27x²

Step-by-step explanation:

What the question is asking is to multiply f(x) and g(x) together:

Step 1: Write out expression

(fg)(x) = 3x²(3x + 9)

Step 2: Distribute

(fg)(x) = 9x³ + 27x²