Correct. Distribute $\displaystyle-{1}\usepackage{cmbright}\Huge\$ to each term in the polynomial: $\displaystyle{\left(-{1}\right)}{3}{{x}}^{{2}}+{\left(-{1}\right)}{\left({2}{x}\right)}+{\left(-{1}\right)}{\left(-{1}\right)}\usepackage{cmbright}\Huge\$

Multiply each coefficient by $\displaystyle-{1}\usepackage{cmbright}\Huge\$ : $\displaystyle-{3}{{x}}^{{2}}+{\left(-{2}{x}\right)}+{1}\usepackage{cmbright}\Huge\$

Rewrite addition of a negative term as subtraction: $\displaystyle-{3}{{x}}^{{2}}-{2}{x}+{1}\usepackage{cmbright}\Huge\$

The missing coefficient is $\displaystyle-{3}\usepackage{cmbright}\Huge\$ .