Question

in the question 6radical x +3 radical y -2radical y +3 radical x -radical y is the answer 9 radical x +1 radical y. i just don't get it thanks

Answer 1

6√x + 3√y - 2√y + 3√x - √y
= 9√x

(6apples + 3 oranges - 2 oranges + 3 apples - 1 orange
= 9 apples)