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 - Page 71: 12

Answer

$18a^{2}-11ab-10b^{2}$

Work Step by Step

Use FOIL: First:$\quad (9a)(2a)=18a^{2}$ Outer:$\quad (9a)(b)=+9ab$ Inner:$\quad (-10b)(2a)=-20ab$ Last:$\quad (-10b)(b)=-10b^{2}$ Outer and Inner parts produce like terms, whose sum is $-11ab$ $=18a^{2}-11ab-10b^{2}$
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