Question

Find the cube of \[- \frac{8}{11}\] . 

 

Answer 1

\[\because\] \[\left( - \frac{m}{n} \right)^3 = - \frac{m^3}{n^3}\]

\[\therefore\] \[\left( - \frac{8}{11} \right)^3 = - \left( \frac{8}{11} \right)^3 = - $\left( \frac{8^3}{{11}^3} \right)$ = - $\left( \frac{8 \times 8 \times 8}{11 \times 11 \times 11} \right)$ = - \frac{512}{1331}\]