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The least value of k for which f(x) = x2+kx+1 is increasing on (1, 2), isA. -2B. -1C. 1D. 2 |
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Answer» Answer is : A. -2 f(x) = x2+kx+1 For increasing f’(x) = 2x+k k ≥ -2x thus, k ≥ -2. Least value of -2 |
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