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4-90.

Simplify the following radical expressions.

$\sqrt { a ^ { 2 } b ^ { 5 } }$
Hint (a):
Find perfect squares. Take their roots pulling them out.
Answer (a):
$\sqrt{a^2b^4b}=ab^2\sqrt{b}$

$\sqrt [ 3 ] { 24 }$
Hint (b):
Find perfect cubes and take out the cube roots of them.

$\sqrt [ 3 ] { x ^ { 5 } y ^ { 6 } }$
Hint (c):
Find perfect cubes and take out the cube roots of them.

$\sqrt [ 5 ] { x ^ { 5 } y ^ { 6 } }$
Hint (d):
Find perfect 5th powers and take out the 5th roots of them.

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