\(x^2+18x+81=0\) को किस रूप में लिखा जा सकता है?
In which form can \(x^2+18x+81=0\) be written?
Explanation opens after your attempt
A. ((x+9)2=0)
Concept
(x-2+18x+81=(x+9)2), so it is a perfect square. In exams, match it using \(2\cdot9x=18x\).
Why this answer is correct
The correct answer is A. ((x+9)2=0). (x-2+18x+81=(x+9)2), so it is a perfect square. In exams, match it using \(2\cdot9x=18x\).
Exam Tip
(x-2+18x+81=(x+9)2), इसलिए यह पूर्ण वर्ग है। परीक्षा में \(2\cdot9x=18x\) से मिलान करें।
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