Question

How do you simplify `sqrt7 (9 sqrt5 - 3 sqrt 7)`?

Answer 1

`9sqrt(35)-21`

Explanation:

`sqt(7)(9sqrt(5)-3sqrt(7))`

`color(white)("XXX")=(9sqrt(5)*sqrt(7))-(3sqrt(7)*sqrt(7))`

`color(white)("XXX")=9sqrt(35)-(3*7)`

`color(white)("XXX")=9sqrt(35)-21`