Solve the quadratic equation. x ² = 16 A) x = 4 or x = 0 B) x = 4 C) x = 4 or x = $-$ 4 D) x = 4 or x = 16

Question

Quizplus · Accepted Answer

Rewriting the equation in standard form: 
$x^2 + 2x - 16 = 0$
Using the quadratic formula: 
$x = \frac{-2 \pm \sqrt{2^2 - 4(1)(-16)}}{2(1)}$
Simplifying: 
$x = \frac{-2 \pm \sqrt{68}}{2}$
$x = \frac{-2 \pm 2\sqrt{17}}{2}$
$x = -1 \pm \sqrt{17}$
Therefore, the roots are approximately -4.12 and 2.12, which means that the best choice is C, since it lists both possible roots.

Solve the Quadratic Equation −-− 4 D) X = 4 or X = 16

Solve the Quadratic Equation $-$ 4
D) X = 4 or X = 16