Let and for . The smallest possible value of…

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

Problem

Let

f(1) = -2

and

f'(x) \geq 4.2

for

1 \leq x \leq 6

. The smallest possible value of

f(6)

is (a) 9 (b) 12 (c) 15 (d) 19