Question

Which of the functions defined below are one-one function(s)?

• A. $f(x)=(x+1),(x \geq-1)$
• B. $g(x)=x+(1 / x)(x>0)$
• C. $h(x)=x^2+4 x-5,(x>0)$
• D. $f(x)=e^{-x},(x \geq 0)$

Answer 1

Answer: (A), (B), (C)

$(x) = x + 1$
$f(x) = x+1$ for $x >-1$

$g(x)=x+\frac{1}{x}$ for $x>0$

Many-one function