\(x^2-18x+k\) को पूर्ण वर्ग बनाने के लिए (k) क्या होगा?
What will (k) be to make \(x^2-18x+k\) a perfect square?
Explanation opens after your attempt
A. (81)
Concept
Half of (-18) is (-9), and ((-9)2=81). Exam tip: the square becomes positive even with a negative sign.
Why this answer is correct
The correct answer is A. (81). Half of (-18) is (-9), and ((-9)2=81). Exam tip: the square becomes positive even with a negative sign.
Exam Tip
(-18) का आधा (-9) है और ((-9)2=81) है। परीक्षा में वर्ग लेते समय चिह्न से मान धन हो जाता है।
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