यदि \(x-\frac{1}{x}=4\) हो तो \(x^2+\frac{1}{x^2}\) का मान क्या होगा?
If \(x-\frac{1}{x}=4\), what is the value of \(x^2+\frac{1}{x^2}\)?
Explanation opens after your attempt
B. (18)
Concept
Squaring gives \(x^2-2+\frac{1}{x^2}=16\), so \(x^2+\frac{1}{x^2}=18\). Exam tip: add (2) in the subtraction identity.
Why this answer is correct
The correct answer is B. (18). Squaring gives \(x^2-2+\frac{1}{x^2}=16\), so \(x^2+\frac{1}{x^2}=18\). Exam tip: add (2) in the subtraction identity.
Exam Tip
वर्ग करने पर \(x^2-2+\frac{1}{x^2}=16\) है इसलिए \(x^2+\frac{1}{x^2}=18\)। परीक्षा में घटाव पहचान में (2) जोड़ें।
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