Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 4 - Section 4.6 - Complex Fractions and Review of Order of Operations - Exercise Set: 83

Answer

$-\frac{55}{64}$

Work Step by Step

When $x=\frac{3}{4}$ and $y=-\frac{4}{7}$: $x^{2}+7y$ $=(\frac{3}{4})^{2}+7(-\frac{4}{7})$ $=(\frac{3}{4}\times\frac{3}{4})-(\frac{7}{1}\times\frac{4}{7})$ $=(\frac{3}{4}\times\frac{3}{4})-(\frac{1}{1}\times\frac{4}{1})$ $=\frac{9}{16}-\frac{4}{1}$ $=\frac{9}{16}-\frac{64}{16}$ $=-\frac{55}{64}$
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