Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 6 - Radical Functions and Rational Exponents - 6-3 Binomial Radical Expressions - Practice and Problem-Solving Exercises - Page 379: 62

Answer

$2\sqrt[3] {4} + 1$

Work Step by Step

To get rid of radicals in the denominator, multiply both numerator and denominator by a factor that will make the radical in the denominator an integer. In this exercise, that factor would be $\sqrt[3] {2^2}$: $\dfrac{4 + \sqrt[3] {2}}{\sqrt[3] {2}} \cdot \dfrac{\sqrt[3] {2^2}}{\sqrt[3] {2^2}}$ Use distributive property: $=\dfrac{4(\sqrt[3] {2^2}) + \sqrt[3] {2}(\sqrt[3] {2^2})}{\sqrt[3] {2}(\sqrt[3] {2^2})}$ Multiply to simplify: $=\dfrac{4\sqrt[3] {4} + \sqrt[3] {2^3}}{\sqrt[3] {2^3}}$ Simplify radicals: $=\dfrac{4\sqrt[3] {4} + 2}{2}$ Simplify the fraction by dividing both numerator and denominator by their greatest common factor, $2$: $2\sqrt[3] {4} + 1$
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