The quadratic equation $\displaystyle{4}{{x}}^{{2}}-{4}{x}-{24}={0}\usepackage{cmbright}\Huge\$ has two solutions.

One of the solutions is $\displaystyle{x}={3}\usepackage{cmbright}\Huge\$ .

The other solution is $\displaystyle{x}=\usepackage{cmbright}\Huge\$ _____.