9. यदि (7' -tn+३) एक पूर्ण वर्ग हो,...
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9. यदि (7' -tn+३) एक पूर्ण वर्ग हो,तो t के मान क्या होंगे? (1) +2 (2) 1, 2 (3) 2,3 । (4) + 1

11th - 12th Class
Maths
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9. ( (4) n^{r}-operatorname{tn}+frac{1}{4} ) के वर्ग होने के लिए ( r=2 ) एवं ( t=pm 1 ) देखें : ( n^{2}-n+frac{1}{4}=n^{2}-2 cdot n cdot frac{1}{2}+frac{1}{4} ) ( =left(n-frac{1}{2}right)^{2} ) ( n^{2}+n+frac{1}{4}=n^{2}+2 . n cdot frac{1}{2}+frac{1}{4} ) ( =left(n+frac{1}{2}right)^{2} )
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