Chapter 6 - Section 6.1 - The Greatest Common Factor and Factoring by Grouping - Exercise Set - Page 427: 15

$4(y-1)$

Work Step by Step

Factoring the $GCF= 4 ,$ the given expression, $4y-4 ,$ is equivalent to \begin{array}{l}\require{cancel} 4 \left( \dfrac{4y}{4}-\dfrac{4}{4} \right) \\\\= 4(y-1) .\end{array}

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