InterviewSolution
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यदि `x^(4)+2x^(3)+ax^(2)+bx+9` एक सम्पूर्ण वर्ग है जहां `a` और `b` का मान क्या होगा?A. `a=5,b=6`B. `a=6,b=7`C. `a=7,b=7`D. `a=7,b=8` |
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Answer» Correct Answer - B `x^(4)+2x^(3)+ax^(2)+bx+9` put `x=1` `=1+2xx1+a+b+9` `=1+2+a+b+9` `12+a+b` To make perfect square no. value of `a+b` must be either 4 or 13. Now option (b) `a=6, b=7, a+b=13`. makes perfect square `(25=5^(2))` |
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