Incorrect. The intercept form of the equation is $\displaystyle{y}=-{1}{{\left({2}{x}+{1}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ . To find the root, solve for $\displaystyle{x}\usepackage{cmbright}\Huge\$ when $\displaystyle{y}={0}\usepackage{cmbright}\Huge\$ .