Answer
$-6$
Work Step by Step
$$\int ^{a}_{b}f\left( x\right) dx=-\int ^{b}_{a}f\left( x\right) dx$$
If $\int ^{4}_{2}xdx=6$ (as given in question) $\Rightarrow $
$$\int ^{2}_{4}xdx=-6$$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 4 - Integration - Page 274: 33
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