Question

simplify&give your answer in positive exponent. ​

Answer 1

Dear, as the question is asked in - exponent, we can get the solution only in - form.

Hope it helps u...

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Answer 2

$( - 5) {}^{ - 3} \times ( - 5) {}^{3} \div (- 5) {}^{7} \\ \\ = ( - 5) {}^{ - 3 + 3} \div \: ( - 5) {}^{7} \\ \\ = ( - 5) {}^{0} \div ( - 5) {}^{7} \\ \\ = 1 \div ( - 5) {}^{7} \\ \\ (a {}^{m} \times a {}^{n} = a {}^{m + n} ) \\ \\ (a {}^{0} = 1)$