Answer
$x^2+x-2$
Work Step by Step
$$(x-1)(x+2)$$ $$=(x\times x)+(x\times 2)+(-1\times x)+(-1\times 2)$$ $$=x^2+2x-x-2$$ $$=x^2+x-2$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 22
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