Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.7 Complete the Square - 4.7 Exercises - Mixed Review - Page 291: 73



Work Step by Step

$a=-4,b=2,c=-7$ $ b^{2}-4ac\qquad$ ...substitute $-4$ for $a,\ 2$ for $b$ and $-7$ for $c$. $=(2)^{2}-4\cdot(-4)\cdot(-7)\qquad$ ...evaluate $(2)^{2}$ $=4-4\cdot(-4)\cdot(-7)\qquad$ ...multiply before subtracting $=4-112$ $=-108$
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