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06 Feb 10
11:20
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Date Joined:
27 Nov 03
Having a bit of a mental block.
If x^y=z
then what does y equal?
Thanks to anyone who can help.
If x^y=z
then what does y equal?
Thanks to anyone who can help.
Show More
x^y = z
can't work out y can you with out taking logs?
can't work out y can you with out taking logs?
Sorry. What I mean is x to the y equals z
for example
2 to the 4 equals 16.
I want to find out what y is when I already know x and z.
for example
2 to the 4 equals 16.
I want to find out what y is when I already know x and z.
you need logs.
x= z to the sq root of y and that is as far as you can go
x= z to the sq root of y and that is as far as you can go
x^y = z
log z = log (x^y) = y log x
y = log z/log x
log z = log (x^y) = y log x
y = log z/log x
sorri - thort the question was x to the power of 'n' multiplied by y = z.
imagine 10^y = 1000000
x = 10, z = 1000000
log z = 6
log x =1
6/1 = 6 = the answer
x = 10, z = 1000000
log z = 6
log x =1
6/1 = 6 = the answer
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