1.

The least value of k for which f(x) = x2+kx+1 is increasing on (1, 2), isA. -2B. -1C. 1D. 2

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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