Use the quadratic formula to solve the quadratic equation. 21 x 2 + 17 x $-$ 8 = 0
A) $\left\{ - \frac { 1 } { 3 } , \frac { 8 } { 7 } \right\}$
B) $\left\{ - \frac { 8 } { 7 } , \frac { 1 } { 3 } \right\}$
C) $\{ - 8,3 \}$
D) $\left\{ - \frac { 7 } { 8 } , \frac { 1 } { 3 } \right\}$
E) $\left\{ - \frac { 8 } { 7 } , 3 \right\}$

Question

Quizplus · Accepted Answer

The quadratic formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ is used with $a = 21$, $b = 17$, and $c = -8$. Solving gives the roots $-\frac{8}{7}$ and $\frac{1}{3}$.

Use the Quadratic Formula to Solve the Quadratic Equation −-− 8 = 0 A)

Use the Quadratic Formula to Solve the Quadratic Equation $-$ 8 = 0
A)