Question

Need to simplify cube roots, work shown would be great! Cube root of 81 Cube root of -64

Answer 1

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

Answer 2

$81=9^2=(3^2)^2=3^4\implies \sqrt[3]{81}=\sqrt[3]{3^4}=\sqrt[3]{3\times3^3}=3\sqrt[3]3$

$-64=(-4)^3\implies\sqrt[3]{-64}=\sqrt[3]{(-4)^3}=-4$