Question

$\alpha + \beta =$
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Answer 1

$\alpha + \beta = not \: known$

Alpha and Beta are two variables they don't have their own values. we can't add them directly until we don't known were they are used or which thing is represent by them.

Answer 2

$\bold \red \star \: \underline{Solution:-}$

According to Polynomial Sum of it's roots.

$\alpha + \beta = \frac{ - b}{a} .$