Answer
$$ P = 40 \sqrt {10} \ cm$$
Work Step by Step
We are now asked to find perimeter. Thus:
$$P = 2l + 2w$$
$$ P = 2(5 \sqrt{10} + 15 \sqrt{10}) $$
$$ P = 40 \sqrt {10} \ cm$$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 8 - Section 8.2 - Solving Quadratic Equations by the Quadratic Formula - Exercise Set - Page 493: 58b
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