Question

How do you evaluate `\sqrt { 63} - \sqrt { 175} - \sqrt { 245}`?

Answer 1

`color(red)(-2sqrt7-7sqrt5`

Explanation:

`sqrt63-sqrt175-sqrt245`

`:.sqrta*sqrta=a`

`:.sqrt(3*3*7)-sqrt(5*5*7)-sqrt(5*7*7)`

`:.3sqrt7-5sqrt7-7sqrt5`

`:.color(red)(-2sqrt7-7sqrt5`