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Number System — Maths STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9MathsNumber System2 Marks
Question
Simplify:$\big(-3+\sqrt{5}\big)\big(-3-\sqrt{5}\big)$
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Answer

$\big(-3+\sqrt{5}\big)\big(-3-\sqrt{5}\big)$$=(-3)^2-\big(\sqrt{5}\big)^2$
$=9-5$
$=4$

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