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:
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.