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Function f(x)=a^x is increasing on R , i...

Function `f(x)=a^x` is increasing on `R` , if (a) `a >0` (b) `a<0` (c) `0 lt a lt 1` (d) `a >1`

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Let `x_{1} lt x_{2}` and both are real number
`a^{x_{1}} lt a^{x_{2}} `
` Rightarrow f(x_{1}) lt f(x_{2}) `
` Rightarrow x_{1} lt x_{2} in`
only possible on` a lt 1`
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