1.

\frac { x } { y } = ( \frac { - 2 } { 3 } ) ^ { 9 } \div ( \frac { - 2 } { 3 } ) ^ { 8 } , \text { find the value of } ( \frac { x } { y } ) ^ { 2 }

Answer»

x/y = (-2/3)^9÷ (-2/3)^8 = (-2/3)^(9-8) = -2/3

so (x/y)² = (-2/3)² = 4/9



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