SOLUTION: Solve for X 4^3x+5 = 1/256 The answer I get is -3 please correct me if I am wrong and why if you can please.

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Question 688042: Solve for X
4^3x+5 = 1/256
The answer I get is -3 please correct me if I am wrong and why if you can please.

Found 2 solutions by stanbon, MathTherapy:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
4^3x+5 = 1/256
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4^(3x+5) = 2^(8)
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2^(6x+10) = 2^8
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6x + 10 = 8
6x = -2
x = -1/3
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Cheers,
Stan H.
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Answer by MathTherapy(10551) About Me  (Show Source):
You can put this solution on YOUR website!

Solve for X
4^3x+5 = 1/256
The answer I get is -3 please correct me if I am wrong and why if you can please.

4%5E%283x+%2B+5%29+=+1%2F256

4%5E%283x+%2B+5%29+=+4%5E-4

3x + 5 = - 4

3x = - 4 - 5

3x = - 9

x+=+%28-+9%29%2F3, or highlight_green%28-+3%29

You're correct!!! To determine if your answer's correct, just do the check!! I assume you know how to do that!!

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