Solve
- $$x ^ { - 2 } + x ^ { - 1 } = 72$$

question 70

Multiple Choice

Solve.
- $$x ^ { - 2 } + x ^ { - 1 } = 72$$

• A) \(\left\{ - \frac { 1 } { 9 } , \frac { 1 } { 8 } \right\}\)
• B) \(\{ 9 , - 8 \}\)
• C) \(\left\{ \frac { 1 } { 9 } , - \frac { 1 } { 8 } \right\}\)
• D) \(\{ - 9,8 \}\)

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