Question 382916
There are always 2 solutions to a quadratic equation, not just usually.
Sometimes it's the same solution 2 times, called a "multiplicity of 2."
eg, {{{x^2 + 4x + 4 = 0}}} has solutions of x = -2 and x = -2.
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Cubic equations (3rd order) always have 3 solutions.
4th power, quartics, always have 4, etc.
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As to the why of this, it's because there are always 2 values that will satisfy a quadratic.