I have no idea how tp simplify 2 sq.root20-3 sq.root7-2 sq.root5+4 sq.root63? I guessed 2 sq.root5-3 sq.root7+4 sq.root63 is it right?

Answer 1

I'm going to assume your problem is this:

2√20 - 3√7 - 2√5 + 4√63

√20 breaks down to √5*2*2
√63 breaks down to √7*3*3

Therefore:
2√20 becomes 4√5
4√63 becomes 12√7

Now we have:
4√5 - 3√7 - 2√5 + 12√7

Combine like terms and simplify:
2√5 + 9√7

That is as far as you can go.

I hope this helps and is what you were asking.

Answer 2

Solution for 9th std all sums