math
posted by edison1969 .
I am not sure how to do these.
1. Simplify 4√6/√30 by rationalizing the denominator. Show your work.
2. Simplify (2√5 + 3√7)^2 Show your work. Justify each step.

4 sqrt 6

sqrt (6*5)
= 4/sqrt 5
* sqrt 5/sqrt 5
= (4/5) sqrt 5