Use the quadratic formula to solve the quadratic equation.
-$x ^ { 2 } - 12 x + 27 = 0$
A)x = -9, -3
B)x = 9, 3
C)x = -9, 3
D)x = 27, 0

Question

Quizplus · Accepted Answer

The quadratic formula is $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$, where $a = 1$, $b = -12$, and $c = 27$. Plugging these values in gives $x = \frac{12 \pm \sqrt{(-12)^2 - 4(1)(27)}}{2(1)} = \frac{12 \pm \sqrt{144 - 108}}{2} = \frac{12 \pm \sqrt{36}}{2} = \frac{12 \pm 6}{2}$, which results in $x = 9$ or $x = 3$.

Use the Quadratic Formula to Solve the Quadratic Equation x2−12x+27=0x ^ { 2 } - 12 x + 27 = 0x2−12x+27=0

Use the Quadratic Formula to Solve the Quadratic Equation $x ^ { 2 } - 12 x + 27 = 0$