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Number systems — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsNumber systems1 Mark
Question
Simplify the expression: $(\sqrt{11}-\sqrt{7})(\sqrt{11}+\sqrt{7})$
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Answer

we have.$(\sqrt{11}-\sqrt{7})(\sqrt{11}+\sqrt{7}) = (\sqrt{11})^{2}-(\sqrt{7})^{2} = 11 - 7 = 4$

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