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P-1 Quadratic Equations — Maths STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10MathsP-1 Quadratic Equations3 Marks
Question
$\alpha^3+\beta^3$
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Answer

$(\alpha+\beta)^3=\alpha^3+\beta^3+3 \alpha \beta(\alpha+\beta) $
$ \Rightarrow(2)^3=\alpha^3+\beta^3+3(-7)(2) $
$\Rightarrow 8+42=\alpha^3+\beta^3 $
$ \Rightarrow \alpha^3+\beta^3=50$

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