SOLUTION: Could you checking to see if I have a right answer? Thank you! Add simplify by collecting like radical terms if possible, assuming the expression represent nonnegative numbers. S

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Question 214682: Could you checking to see if I have a right answer? Thank you!
Add simplify by collecting like radical terms if possible, assuming the expression represent nonnegative numbers.
Sqrt(7a)+6sqrt(63a^3)
Sqrt(7a)+6sqrt(9*7*a^2*a)
Sqrt(7a)+6*3sqrt(7a)
=(1+18a)Sqrt(7a)
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct. However:
.
Sqrt(7a)+6sqrt(63a^3)
Sqrt(7a)+6sqrt(9*7*a^2*a)
Sqrt(7a)+6*3sqrt(7a)--forgot the leading 'a' should be:
Sqrt(7a)+6*3*a*sqrt(7a)
=(1+18a)Sqrt(7a)