Final Exam Review Help, College Algebra?

Question

Directions: Solve.

2^8x-5 =1/8

What i am stuck on:
I know that I need to make the 1&#92;8 into something that has a base of 2 like if it were 3^x+5=27 the 27 would become 3^3. 'm stuck on how the chance the 1/8 into it's next step. directions on how you solve this would be appreciated! :)

scott8148 · Accepted Answer

2 * 2 * 2 = 2^3 = 8 ___ 1/8 = 1 / 2^3 = 2^-3

? · Answer

2^8x-5 =1/8

Remember that 1 = anything to the zero power ...  for you 2^0
8 = 2x2x2  =  2^3

Now, what is the rule for division ...  you can take it from here.

SumDude · Answer

You should put more parentheses in the problem for clarity's sake.

AS PER PEDMAS you asked { [ (2^8) * x ] - 5 } = 1/(2^3)

maybe that is what you meant, but we cannot be sure.

{But I will bet you meant 2^(8x-5) ... in which case x = 1/4}

BQ: Why did my high school teacher not tell me about these things called parentheses??

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Final Exam Review Help, College Algebra?

3 Answers