√8-√2+√32 How can I solve this?

√8 is like √4x2. You can square root a 4 to get a 2, so √8 becomes 2√2. in √32, it can be √16x2. You can square root a 16 to get a 4, so √32 becomes 4√2.
Basically, this is surds, so you must change all the numbers in this equation so there square root numbers matches (like algebra). The new equation is

2√2 - √2 + 4√2
Which is 5√2.

The square root numbers behave like variables in algebra if you're doing surds.

You can't solve it. Its not an equation. You can only simplify this.
If you mean How can I simplify this, then the other answers are correct. Use correct language please! Will you?

√8-√2+√32
=√(4*2)-√2+√(2*16)
= (√4)*(√2)-√2+(√2)*(√16)
= (2√2)-√2+(√16)*(√2)
= 2√2-√2+4√2
= 5√2

√8 - √2 + √32
= √(2^2 * 2) - √2 + √(4^2 * 2)
= √(2^2) * √2 - √2 + √(4^2) * √2
= 2 * √2 - √2 + 4 * √2
= 2√2 - √2 + 4√2
= (2 - 1 + 4)√2
= 5√2