The least value of for which the function is an increasing function in the interval is

MATHEMATICS · Single correct · CBSE · Mathematics · Applications of Derivatives · Applications of Derivatives

Problem

The least value of

k

for which the function

x^2 + kx + 1

is an increasing function in the interval

1 < x < 2

is (a) -4 (b) -3 (c) -1 (d) -2