Simplify `sqrt(32)`.

`2sqrt(4)`

`2sqrt(8)`

`4sqrt(2)`

`4sqrt(8)`

Which of the following is correct?

`sqrt(2) + sqrt(5) ＝ sqrt(7)`

`2 + 3 sqrt(6)＝ 5 sqrt(6)`

Both of these are correct.

Neither of these are correct.

Which of these is not equal to the other three?

`sqrt(x^21)`

`x^10sqrt(x)`

`sqrt(x^7)sqrt(x^3)`

`sqrt(x^17)sqrt(x^4)`

Which of these is equal to 7?

`(3 - sqrt(2))(3 - sqrt(2))`

`(3 + sqrt(2))(3 - sqrt(2))`

`(4 - sqrt(3))(4 + sqrt(3))`

`(4 + sqrt(3))(4 + sqrt(3))`