Answer
$x^2+x-90$
Work Step by Step
FOIL means you combine the first term from each expression, the inside terms, the outside terms and the last terms.
$x^2+10x-9x-90=x^2+x-90$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.2 - Finding the Product of Two Binomials Mentally - Exercise - Page 347: 14
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