Answer
Answer -10-x is correct.
Work Step by Step
Answer is correct -10-x because:
$\frac{100-x^{2}}{x-10}$=
$\frac{10^{2}-x^{2}}{x-10}$=
$\frac{(10-x)(10+x)}{-(10-x)}$=
$\frac{(10+x)}{(-1)}$=-(10+x)=-10-x
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.1 - Simplifying Rational Expressions - Exercise Set - Page 491: 66
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