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What is y in terms of x?

Expert replies
Source: — Problem Solving |

by anju » Tue Sep 30, 2008 12:58 pm
5^x - 5^(x-3)
= 5^(x-3) (5^3 - 1) - take out common values
= 5^(x-3) (125-1)
=124*5^(x-3) = 124*5^y

so y = x-3
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