SOLUTION: Solve for x: log_{8}1/256 = x

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Question 409680: Solve for x:
log_{8}1/256 = x

Answer by jsmallt9(3758)   (Show Source): You can put this solution on YOUR website!

First we'll write this in exponential form. In general is equivalent to . Using this pattern on your equation we get:

Since both 8 and 1/256 are powers of 2, and (so ), we will be able to find the solution "by hand". Rewriting the 8 and the 1/256 as a powers of 2 we get:

On the right side the rule for exponents when raising a power to a power tells use to multiply the exponents:

Now the equation says that two powers of 2 are equal. The only way this can be true is if the exponents themselves are equal, too. So:
-8 = 3x
Dividding by 3 we get:

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