Solved

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

Question 70

Multiple Choice

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


A) {−19,18}\left\{ - \frac { 1 } { 9 } , \frac { 1 } { 8 } \right\}
B) {9,−8}\{ 9 , - 8 \}
C) {19,−18}\left\{ \frac { 1 } { 9 } , - \frac { 1 } { 8 } \right\}
D) {−9,8}\{ - 9,8 \}

Correct Answer:

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