Standard form of a quadratic equation is $\displaystyle{a}{{x}}^{{2}}+{b}{x}+{c}={0}\usepackage{cmbright}\Huge\$ .

The given equation is the same as $\displaystyle{7}{{x}}^{{2}}+{1}{x}+{\left(-{5}\right)}={0}\usepackage{cmbright}\Huge\$ .

The values of a, b, and c are the three coefficients.