For which value of is the function one-to-one on ?

MATHEMATICS · Single correct · CBSE · Mathematics · Relations and Functions · Relations and Functions

Problem

For which value of

k

is the function

f(x)=kx^2+7x

one-to-one on

\mathbb{R}

? (a)

k>0

(b)

k<0

(c)

k=0

(d) No real value of

k