Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 5 - Section 5.1 - Exponents - Exercise Set: 125

Answer

Due to the Order of Operations, work inside parentheses is done before exponents are used. Because $-1\times5$ in the first example is inside the parentheses, you must multiply before you use exponents. This results in $-5$ to the fourth power, which gives an answer of $625$. In the second example given no parentheses are present, which means we must solve exponents before we multiple by the $-1$. This results in us solving $-1\times5^{4}$, which equals $-625$.

Work Step by Step

$(-1\times5)^4$ Multiply $5$ by $-1$ $(-5)^4$ Take $-5$ to the fourth power $(-5\times-5\times-5\times-5)$ Multiply $-5$ by itself four times $(25\times25)$ Multiple $25$ by $25$ $625$ $-1\times5^4$ Take $5$ to the fourth power $-1\times(5\times5\times5\times5)$ Multiply $5$ by itself four times $-1\times(25\times25)$ Multiple $25$ by $25$ $-1\times625$ Multiply by $-1$ $-625$
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