# Chapter 8 - Polynomials and Factoring - 8-3 Multiplying Binomials - Practice and Problem-Solving Exercises: 33

$10a^3+12a^2+9a-20$

#### Work Step by Step

$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2a^2+4a+5$ $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 5a-4}$ $\ \ \ \ \ \ \ \ -\ \ 8a^2-16a-20\longrightarrow$ multiply by -4 $\underline{10a^3+20a^2+25a\ \ \ \ \ \ \ \ \ }\longrightarrow$ multiply by 5a $10a^3+12a^2+\ \ 9a-20\ \longrightarrow$ combine like terms

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