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Expressions

by tanyajoseph » Mon Sep 03, 2007 11:17 am
If 5^x - 5^(x-3) = 124(5^y) hat is y in terms of x?

x
x-6
x-3
2x+3
2x+6

Can someone provide a detailed walkthrough and solve the above pproblem?
Thank you very much for any help.
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Re: Expressions

by jaspreet.sharma » Mon Sep 03, 2007 10:36 pm
tanyajoseph wrote:If 5^x - 5^(x-3) = 124(5^y) hat is y in terms of x?

x
x-6
x-3
2x+3
2x+6

Can someone provide a detailed walkthrough and solve the above pproblem?
Thank you very much for any help.
Taking 5^(x-3) as common

5^(x-3) [5^ 3 - 1 ] = 124(5^y)

124 * 5^(x-3) = 124(5^y)

Dividing by 124

5^(x-3) = 124(5^y)
Comparing exponentials

x-3 = y

Answer is C
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