Since the function is in the form $\displaystyle{f{{\left({x}\right)}}}={{b}}^{{x}}\usepackage{cmbright}\Huge\$ , where $\displaystyle{b}>{1}\usepackage{cmbright}\Huge\$ , its graph will increase from left to right, and this one does not. Additionally, this graph has negative values for $\displaystyle{f{{\left({x}\right)}}}\usepackage{cmbright}\Huge\$ , and if $\displaystyle{b}>{1}\usepackage{cmbright}\Huge\$ all the values for $\displaystyle{f{{\left({x}\right)}}}={{b}}^{{x}}\usepackage{cmbright}\Huge\$ would have to be positive values.