You can put this solution on YOUR website! (square root of 3 + 3)(square root of 7 - 2)
This is multilication of surds.
sqr root of 7(square root of 3 + 3)-2((square root of 3 + 3)
sqr root of 7*3 + 3 sqr root of 7 - 2 sqr root of 3 - 2*3
sqr root of 21 +3 sqr root of 7 - 2 sqr root of 3 - 6