How do you multiply 3x(x+9)?

1 Answer
Jun 25, 2015

 = color(green)(3x^2 + 27x

Explanation:

$\textcolor{g r e e n}{3 x} \left(x + 9\right)$

Here $\textcolor{g r e e n}{3 x}$ needs to be multiplied with each term within brackets:

$= \textcolor{g r e e n}{3 x} . \left(x\right) + \textcolor{g r e e n}{3 x} . \left(9\right)$
 = color(green)(3x^2 + 27x