View Full Version : How to solve these inequations?
endlesslove230
Oct 15, 2011, 01:08 AM
5^{(log_5)^2 {x}} x^{log_5 x} < 10
(sqrt{2} 1)^{\frac{6(x-1)}{x 1}} \leq (sqrt{2} - 1)^{-x}
endlesslove230
Oct 15, 2011, 01:10 AM
5^{(log_5)^2 x} + x^{log_5 x} < 10 sorry...
endlesslove230
Oct 15, 2011, 01:12 AM
(sqrt{2} + 1)^{\frac{6(x-1)}{x+1}} \leq (sqrt(2) - 1)^{-x}
ebaines
Oct 15, 2011, 06:36 AM
5^{(log_5)^2 x} + x^{log_5 x} < 10 sorry...
You need to be careful with the parentheses. For the first part of this equation you wrote:
5^{(log_5)^2 x}
which doesn't make sense. Did you mean:
5^{(log_5 x)^2}
or perhaps
5^{(log_5 x^2)}
?
In any event, you should be able to solve this if you apply the principle that
a ^{log_a b} = b
Post back what you get and we'll check it for you.
endlesslove230
Oct 15, 2011, 12:17 PM
In fact I mean that 2 is the power of the logarithm, not of x or 5.
I know that formula, but I'm not sure if I can apply it in this case.
If I had (5^{log_5 x})^2, the result was clearly x^2.
But I have 5^{{log_5}^2 x} = 5^{{log_5 x}{log_5 x}}, so I don't think I can use it any more.
Unknown008
Oct 16, 2011, 07:02 AM
Remember:
a^{mn} = (a^m)^n
Fun stuff you've got there though :)