Question

How do you simplify `4*sqrt20 - *sqrt45 + 7*sqrt5`?

Answer 1

`12*sqrt(5)`

Explanation:

`4*sqrt(20) - sqrt(45)+7*sqrt(5)`

Simplifying
`4*sqrt(5*4) - sqrt(5*9)+7*sqrt(5)`

`4*2*sqrt(5) - 3*sqrt(5)+7*sqrt(5)`

`8*sqrt(5) - 3*sqrt(5)+7*sqrt(5) = 12*sqrt(5)`

I hope this hekos,
Steve