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Every quadratic equation has two solutions.

If the quadratic expression that's equal to zero is a perfect square,

then the two solutions are equal, and they look like one solution.

Example:

x2 - 6x + 9 = 0

(x - 3)(x - 3) = (x - 3)2 = 0

x = 3

and

x = 3.

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Q: What does it mean for a quadratic to have one solution?
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