Prealgebra (7th Edition)

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

Chapter 1 - Section 1.7 - Exponents and Order of Operations - Exercise Set - Page 74: 77



Work Step by Step

Solve using PEMDAS (The priority list for solving expressions: Parentheses, exponents, [multiplication, division], [addition, subtraction]. For the operations in the brackets, solve from left to right) $\dfrac{9^2+2^2-1^2}{8\div2\cdot 3\cdot 1\div3} = \dfrac{81+4-1}{8\div2\cdot 3\cdot 1\div3} = \dfrac{81+4-1}{4} = \dfrac{84}{4} = 21$
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