SOLUTION: if an equation has y to the second power can it still be a function

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Question 686485: if an equation has y to the second power can it still be a function
Answer by jim_thompson5910(35256) About Me  (Show Source):
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No it cannot. If you solve for y, you take the square root of both sides. However, the square root will have a plus/minus, which invalidates the fact that it can be a function.