iamconfused: How does a problem like this 6*sqrt(125a^15 work?
6*sqrt(125a^15)
did you want the square root or the cubed root.
You have asked for the square root, so I will do that.
Look at 125a^15 and take out any square factors
125a^15 = 25a^14 * 5a = 5
2 * (a
7)
2 * 5a
6*sqrt(125a^15) = 6*sqrt[5
2 * (a
7)
2 * 5a]
= 6 * sqrt[5
2 * (a
7)
2 ] * sqrt(5a)
and hopefully you can finish it.
+118653 
