Flag 10 grade maths> If 25^n-1+100=5^2n-1 then find the value ...
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If 25^n-1+100=5^2n-1 then find the value of n ?
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Malyarpita Singh , 6 Years ago
Grade 10
anser 1 Answers
Arun

Last Activity: 6 Years ago

25^n-1 + 100 = 5^2n-1

25^n.25^-1 + 100= 5^2n.5^-1

25^n.25^-1 + 100= 25^n.5^-1

Now take 25^n.25^-1 part to RHS then will get

25^n.5^-1 - (25^n.25^-1 )=100

Now take 25^n common from LHS

25^n(1/5 - 1/25)= 100

25^n(4/25)=100

25^n=100*25/4

25^n=25*25

25^n=25^2

Now we can say that

n=2.

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