Question

${5}^{10} \div {5}^{8} = {5}^{x}$
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Answer 1

${5}^{(10-8)}$ = ${5}^{x}$

${5}^{2}$ = ${5}^{x}$

Since, Bases are same. So, their powers will become equal.

$\fbox {x\: =\: 2}$