Question

simplify (81/49)-³by²

Answer 1

${( \frac{81}{49}) }^{ \frac{ - 3}{2} } \\ \\ {( \frac{ {9}^{2} }{ {7}^{2} }) }^{ \frac{ - 3}{2} } \\ \\ {( \frac{9}{7}) }^{2 \times \frac{ - 3}{2} } \\ \\ { \frac{9}{7} }^{ - 3} \\ \\ { \frac{7}{9} }^{3 } \\ \\ \frac{343}{729}$

Answer 2

(81/49)-3/2

=(9^2/7^2)-3/2

=(9/7)2×-3/2

=(9/7)-3

=(7/9)3

=343/729

this ans is correct