# How do you multiply (5a^3-9)(3a^2-1)?

Apr 29, 2017

color(blue)(15a^5-5a^3-27a^2+9
$\textcolor{w h i t e}{a a a a a a a a a a a a a}$$5 {a}^{3} - 9$
$\textcolor{w h i t e}{a a a a a a a a a a a a a}$$\underline{3 {a}^{2} - 1}$
$\textcolor{w h i t e}{a a a a a a a a a a a a a}$$15 {a}^{5}$$\textcolor{w h i t e}{a a a a a a a a a}$$27 {a}^{2}$
$\textcolor{w h i t e}{a a a a a a a a a a a a a a a a a a a}$underline(-5a^3color(white)(aaaaaaaaaaa)$+ 9$
$\textcolor{w h i t e}{a a a a a a a a a a a a a a}$color(blue)(15a^5-5a^3-27a^2+9