Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 7 - Polynomial Equations and Factoring - 7.5 - Factoring x 2 + bx + c - Exercises - Page 389: 29

Answer

The solutions are $m=-2$ and $m=-1$.

Work Step by Step

To factor the polynomial $m^{2}+bm+c$, we need to find two numbers $p$ and $q$ such that $p+q=b$ and $pq=c$. In this case, $b=3$ and $c=2$. $\implies p=2$ and $q=1$. Then, $m^{2}+3m+2=(m+p)(m+q)=(m+2)(m+1)$ $m^{2}+3m+2=0\implies (m+2)(m+1)=0$ $\implies m+2=0$ or $m+1=0$ $\implies m=-2$ or $m=-1$ The solutions are $m=-2$ and $m=-1$.
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