Question

Simplify this sum with explanation​

Answer 1

Step-by-step explanation:

hope it's helpful to you

Answer 2

Step by step: This is the method you have to use in schools

${5}^{ - 9 - ( - 10)} \times {5}^{ - 3}$

$= {5}^{ - 9 + 10} \times {5}^{ - 3}$

$= {5}^{1} \times {5}^{ - 3}$

$= {5}^{1 + ( - 3)}$

$= {5}^{ - 2}$

$\frac{1}{ {5}^{2} } = \frac{1}{25}$

Here is the correct answer

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Step-by-step explanation:

Formulas used-

${a}^{m} \times {a}^{n} = {a}^{m + n}$

${a}^{m} \div {a}^{n} = {a}^{m - n}$

${a}^{ - m} = \frac{1}{ {a}^{m} }$

Hope it will help ☺