## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 5 - Polynomials and Factoring - 5.3 Factoring Trinomials of the Type ax2+bx+c - 5.3 Exercise Set - Page 326: 28

#### Answer

$(a-1)(25a+2)$

#### Work Step by Step

Using the factoring of trinomials in the form $ax^2+bx+c,$ the $\text{ expression }$ \begin{array}{l}\require{cancel} 25a^2-23a-2 \end{array} has $ac= 25(-2)=-50$ and $b= -23 .$ The two numbers with a product of $c$ and a sum of $b$ are $\left\{ -25,2 \right\}.$ Using these $2$ numbers to decompose the middle term of the trinomial expression above results to \begin{array}{l}\require{cancel} 25a^2-25a+2a-2 .\end{array} Grouping the first and second terms and the third and fourth terms, the given expression is equivalent to \begin{array}{l}\require{cancel} (25a^2-25a)+(2a-2) .\end{array} Factoring the $GCF$ in each group results to \begin{array}{l}\require{cancel} 25a(a-1)+2(a-1) .\end{array} Factoring the $GCF= (a-1)$ of the entire expression above results to \begin{array}{l}\require{cancel} (a-1)(25a+2) .\end{array}

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