SOLUTION: Why are there usually two solutions in quadratic equations?

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Question 114913: Why are there usually two solutions in quadratic equations?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
Why are there usually two solutions in quadratic equations?

Because the ± in the quadratic formula

x+=+%28-b+%2B-+sqrt%28+b%5E2-4ac+%29%29%2F%282a%29+

will result in two solutions, one for the + and
one for the - except when b%5E2-4ac = 0

Zero is the only number which does not have two
distinct square roots.

Edwin