Solve the equation by the quadratic formula.
-
A) 4
D) 4i

Question

Solve the equation by the quadratic formula.
-
A) 4 
D) 4i

Quizplus · Accepted Answer

Since the equation cannot be factored easily, we must use the quadratic formula: 
$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$
Plugging in the coefficients given in the equation, we get:
$x = \frac{-10 \pm \sqrt{100 - 4(1)(-7)}}{2(1)}$
$x = \frac{-10 \pm \sqrt{128}}{2}$
$x = \frac{-10 \pm 8\sqrt{2}}{2}$
$x = -5 \pm 4\sqrt{2}$
Therefore, the correct answer is (C) 11ebb63d_1bdf_e421_b851_6b673c40ad28_TB8475_11. Since the equation is not given, we cannot solve it.

Solve the Equation by the Quadratic Formula