\(81r^2-18rs+s^2\) को गुणनखंडित कीजिए।
Factorise \(81r^2-18rs+s^2\).
Explanation opens after your attempt
A. ((9r-s)2)
Concept
It is ((9r)2-2\cdot9r\cdot s+s-2). Exam tip: choose the answer by the sign of the middle term.
Why this answer is correct
The correct answer is A. ((9r-s)2). It is ((9r)2-2\cdot9r\cdot s+s-2). Exam tip: choose the answer by the sign of the middle term.
Exam Tip
यह ((9r)2-2\cdot9r\cdot s+s-2) है। परीक्षा में मध्य पद के चिह्न से उत्तर चुनें।
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