Question

by using laws of exponents
answer is=81/49​

Answer 1

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Answer 2

Answer: 81/49

Step-by-step explanation:

Here,

$\frac{9}{7} ^{-10} = \frac{7}{9} ^{10} \\\\So, (\frac{7}{9}) ^{-12} . (\frac{7}{9} )^{10} = (\frac{7}{9})^{-2} = (\frac{9}{7}) ^{2} = \frac{81}{49}$