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I saw the following problem on an episode of King of the Hill, and immediately starting doing it, but am getting weird results. I don't get what I'm doing wrong.
y + root (y - 3) - 5 = 0
I subtract root (y - 3):
y - 5 = - root (y - 3)
At this point, if I plug in 7, I get no result: 2 = -2.
I square both sides:
y^2 - 10y + 25 = y - 3
Now if I plug in 7, I get 4 = 4... what did I do wrong?
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