यदि \(x=\sqrt{3}+\sqrt{2}\) तो \(x^2-5\) क्या होगा?
If \(x=\sqrt{3}+\sqrt{2}\) then what is \(x^2-5\)?
Correct answer and explanation
A. \(2\sqrt{6}\)
Simple Explanation
दिया है \(x=\sqrt{3}+\sqrt{2}\)। अतः \(x^2=(\sqrt{3}+\sqrt{2})^2=3+2+2\sqrt{3}\sqrt{2}=5+2\sqrt{6}\)। इसलिए \(x^2-5=2\sqrt{6}\)। \(\sqrt{6}\) विकल्प में 2 का गुणनफल छूट गया है। परीक्षा टिप: \((a+b)^2=a^2+b^2+2ab\) में मध्य पद \(2ab\) अवश्य लिखें। / Given \(x=\sqrt{3}+\sqrt{2}\), \(x^2=(\sqrt{3}+\sqrt{2})^2=3+2+2\sqrt{3}\sqrt{2}=5+2\sqrt{6}\). Therefore, \(x^2-5=2\sqrt{6}\). The option \(\sqrt{6}\) misses the factor 2 in the middle term. Exam tip: while using \((a+b)^2=a^2+b^2+2ab\), do not omit \(2ab\).
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