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1 vote
Need to simplify cube roots, work shown would be great!

Cube root of 81
Cube root of -64

User Yanery
by
8.3k points

2 Answers

4 votes
1.) 4.32
2.)-4
copy the work on square root calculator

User Mohnkuchenzentrale
by
8.6k points
2 votes

81=9^2=(3^2)^2=3^4\implies \sqrt[3]{81}=\sqrt[3]{3^4}=\sqrt[3]{3*3^3}=3\sqrt[3]3


-64=(-4)^3\implies\sqrt[3]{-64}=\sqrt[3]{(-4)^3}=-4
User Mikewaters
by
7.8k points

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