Let be defined for all real

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Let

f(x)=x^{3}+ax

be defined for all real

x

. Choose the option for which

f

is one-to-one on

\mathbb{R}

. (a)

a>0

(b)

a=0

(c)

a\ge 0

(d)

\text{all real }a

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