How to you answer the following question using logs: What are the two solutions for x of 2^(2x)-8*2^x+15=0 In words: 2 to the power 2x, -8 multiplied by 2 to the power x, plus 15. Please help!
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Originally Posted by haku How to you answer the following question using logs: What are the two solutions for x of 2^(2x)-8*2^x+15=0 In words: 2 to the power 2x, -8 multiplied by 2 to the power x, plus 15. Please help! then this is just a quadratic equation in u, that is so u=3 or u=5 but since therefore
Last edited by kalagota; Oct 31st 2007 at 06:06 AM.
Thanks for the help and your explanation
From & From this way, it's easier to check the solutions without a calculator. -- So for & therefore You can do the same procedure to verify the second solution.
What about questions in the form: log(base6)4 + log(base6)9 + log(base3)45 -log(base3)5 Thanks
Originally Posted by haku What about questions in the form: log(base6)4 + log(base6)9 + log(base3)45 -log(base3)5 Thanks It would be log(base 6) 36 + log(base 3) 9 Can you take it from here? Just to help you, the answer should be 4.
I understand that part but what do you do when the base in a different value?
Originally Posted by haku I understand that part but what do you do when the base in a different value? what i usually do is, to let a variable to the sum of logs with same base and another variable for the other base, then i add them after solving independently..
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