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: 37

Answer

The solutions are $m=11$ and $m=4$.

Work Step by Step

$m^{2}+10=15m-34\implies m^{2}-15m+44=0$ To factor the polynomial $m^{2}+bm+c$ to $(m+p)$ and $(m+q)$, we need to have $p+q=b$ and $pq=c$. In this case, $b=-15$ and $c=44$. $\implies p=-11$ and $q=-4$. Then, $m^{2}-15m+44=(m-11)(m-4)$ $m^{2}-15m+44=0\implies (m-11)(m-4)=0$ Using zero-product property, we have $m-11=0$ or $m-4=0$ $\implies m=11$ or $m=4$ The solutions are $m=11$ and $m=4$.
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