यदि \(x=4+\sqrt{15}\) है तो \(x^2-8x\) का मान क्या है?
If \(x=4+\sqrt{15}\), what is the value of \(x^2-8x\)?
Explanation opens after your attempt
B. (-1)
Concept
\(x^2=31+8\sqrt{15}\) and \(8x=32+8\sqrt{15}\). Subtracting gives (-1).
Why this answer is correct
The correct answer is B. (-1). \(x^2=31+8\sqrt{15}\) and \(8x=32+8\sqrt{15}\). Subtracting gives (-1).
Exam Tip
\(x^2=31+8\sqrt{15}\) और \(8x=32+8\sqrt{15}\) है। घटाने पर (-1) मिलता है।
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