Question

21 th question best answer will be awarded as brainliest

Answer 1

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Answer 2

21.

Given Equation is (5^x - 5^x-1) = 100

$5^{x-1} ( 5^{1} - 1) = 100$

$5^{x - 1} (4) = 100$

$5^{x-1} = \frac{100}{4}$

$5^{x - 1} = 25$

$5^{x-1} = 5^2$

x - 1 = 2

x = 3.


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