Hello,

I am new to Purplemath, and am experiencing some difficulty with the above subject. Here is the problem:

(Square root y + Square root y+7=7), I raised the entire equation to the power of 2, to elimnate the square root.

This is what I have so far:

y+y+7=49

Subtracted 7 from both sides

Gave me 2y=42

Divided 2 from both sides

Gave me y=21

But when plugged 21 in for y, didn't equal 7.