Question:
Mark the correct alternative in the following:
Function $f(x)=a^{x}$ is increasing or $R$, if
A. $a>0$
B. $a<0$
C. $a>1$
D. $a>0$
Solution:
Let $\mathrm{x}_{1}<\mathrm{x}_{2}$ and both are real number
$a^{x_{1}} $\Rightarrow f\left(x_{1}\right) $\Rightarrow x_{1} only possible on $a>1$