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(C) The standard quadratic formula for the equation $ax^2 + bx + c = 0$ is $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.Let us check option $(c)$: $\frac{

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$\frac{2c}{-b \mp \sqrt{b^2 - 4ac}}$

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(C) The standard quadratic formula for the equation $ax^2 + bx + c = 0$ is $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.Let us check option $(c)$: $\frac{2c}{-b \mp \sqrt{b^2 - 4ac}}$.Rationalizing the denominator by multiplying the numerator and denominator by $(-b \pm \sqrt{b^2 - 4ac})$:$\frac{2c(-b \pm \sqrt{b^2 - 4ac})}{(-b \mp \sqrt{b^2 - 4ac})(-b \pm \sqrt{b^2 - 4ac})} = \frac{2c(-b \pm \sqrt{b^2 - 4ac})}{b^2 - (b^2 - 4ac)} = \frac{2c(-b \pm \sqrt{b^2 - 4ac})}{4ac} = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.Thus,option $(c)$ is equivalent to the standard quadratic formula.

If $ax^2 + bx + c = 0$,then $x =$

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