Given that 25×125x=525\times125^{x}=5, find the value of xx. Answer x=x= ...

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Worked solution

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1. Rewrite each number as a power of 5.

25×125x=525\times125^x=5

52×(53)x=515^2\times(5^3)^x=5^1

2. Apply laws of indices and solve for $x$.

52×53x=515^2\times5^{3x}=5^1

52+3x=515^{2+3x}=5^1

Equating indices,

2+3x=12+3x=1

3x=−13x=-1

x=−13x=-\dfrac{1}{3}

Answer

x=−13x=-\dfrac{1}{3}

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