Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Mid-Chapter Check Point: 1

Answer

$12x^2-x-35$

Work Step by Step

RECALL: (1) $(a+b)(c+d) = a(c+d) + b(c+d)$ (2) $a(b+c) = ab+ac$ Use rule (1) above to obtain: $=3x(4x-7)+5(4x-7)$ Use rule (2) above to obtain: $=3x(4x) -3x(7) + 5(4x) -5(7) \\=12x^2-21x+20x-35$ Combine like terms to obtain: $=12x^2-x-35$
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