SAT Mathematics Practice Test 3

Dividing each side of the given equation by 3 gives the equivalent equation ${\mathit{x}}^2+4\mathit{x}+2=0$. Then using the quadratic formula, $\frac{-\mathit{b}\sqrt{{\mathit{b}}^2-4\mathit{a}\mathit{c}}}{2\mathit{a}}$with $\mathit{a}=1,\mathit{b}=4,$ and $\mathit{c}=2$, gives the solutions $\mathit{x}=-2\pm \sqrt{2}$
Choices B, C, and D are incorrect and may be the result of errors when applying the quadratic formula.