Solve Equations That Are Quadratic in Form
Solve the Equation $$\mathrm { x } ^ { - 2 } + \mathrm { x } ^ { - 1 } - 56 = 0$$

Multiple Choice

Solve Equations That Are Quadratic in Form
Solve the equation by making an appropriate substitution.
- $$\mathrm { x } ^ { - 2 } + \mathrm { x } ^ { - 1 } - 56 = 0$$

A) $\left\{ - \frac { 1 } { 8 } , \frac { 1 } { 7 } \right\}$
B) $\left\{ \frac { 1 } { 8 } , - \frac { 1 } { 7 } \right\}$
C) $\{ 8 , - 7 \}$
D) $\{ - 8,7 \}$