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Consider the quadratic equation:
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Notice that we get our TWO solutions of a quadratic from the +- portion.
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Now, let's focus our attention on (the term after the +-):
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Notice that if:
b^2 is EQUAL to 4ac we will be taking the square root of zero. In this case,
we will get only one solution:
or
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As an example, consider this:
x^2+2x+1 = 0
factoring we get:
(x+1)(x+1) = 0
Notice that we ONLY have a single solution of:
x = -1
