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It can easily be seen, by polynomial expansion, that the following equation is equivalent to the quadratic equation:
:<math>\left(x+\frac{b}{2a}\right)^2=\frac{b^2-4ac}{4a^2}</math>
Taking the square root of both sides, and isolating
:<math>x=\frac{-b\pm\sqrt{b^2-4ac\ }}{2a}</math>
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