College Algebra (6th Edition)

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: 22

Answer

$x^2+x-2$

Work Step by Step

$$(x-1)(x+2)$$ $$=(x\times x)+(x\times 2)+(-1\times x)+(-1\times 2)$$ $$=x^2+2x-x-2$$ $$=x^2+x-2$$
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