For which value of is the function defined by one–one?

MATHEMATICS · Single correct · AP · AP Precalculus · Exponential and Logarithmic Functions · Exponential and Logarithmic Functions

Problem

For which value of

k

is the function

f:\mathbb{R}\to\mathbb{R}

defined by

f(x)=kx^{2}+4x

one–one? (a)

k=-1

(b)

k=2

(c)

k=0

(d)

k=1

Related theory

Browse the problem library