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A quadratic equation has exactly one real number solution. Which is the value of its discriminant?
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The discriminant is the number under the square root of the quadratic formula

[tex]x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

The discriminant formula is [tex]D = b^2-4ac[/tex]

If D = 0, then the whole square root portion is 0 meaning we end up with the solution [tex]x = -\frac{b}{2a}[/tex]

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