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The equation, ax^(2) + bx + c = 0, can b...

The equation, `ax^(2) + bx + c = 0`, can be expressed as `aalpha^(2) + balpha + c = 0`, only when `'alpha'` is `"____"` of the equation.

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PEARSON IIT JEE FOUNDATION-QUADRATIC EXPRESSIONS AND EQUATIONS-Very Short
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