### Home > PC > Chapter 4 > Lesson 4.2.2 > Problem4-90

4-90.

1. $\sqrt { a ^ { 2 } b ^ { 5 } }$

Find perfect squares. Take their roots pulling them out.

$\sqrt{a^2b^4b}=ab^2\sqrt{b}$

1. $\sqrt [ 3 ] { 24 }$

Find perfect cubes and take out the cube roots of them.

1. $\sqrt [ 3 ] { x ^ { 5 } y ^ { 6 } }$

Find perfect cubes and take out the cube roots of them.

1. $\sqrt [ 5 ] { x ^ { 5 } y ^ { 6 } }$

Find perfect 5th powers and take out the 5th roots of them.