TrophyHusband 0 #1 March 23, 2007 I'm getting my ass kicked by a problem. i don't know how to write it here, but i'll give it a shot. 2 raised to the power of (1/log 5 X)=1/16 the 5 after the log is the base. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
SuperGirl 0 #2 March 23, 2007 I use underscore to denote subscripts, so log_5 specifies that 5 is the subscript, just for clarity, although I'm sure you would've understood what I meant anyway. And ^ denotes power. So here goes: 2^(1/log_5 (x)) = 1/16 notice that 1/16 is actually 1/2^4 so it's actually 2^(-4) 2 raised to that mess is equal to 2 raised to the power -4, which means big mess equals -4 i.e. (1/log_5(x)) = -4 so when we invert the fraction we get log_5 (x) = -1/4 so x is 5^(-1/4) (edited to fix typos) Quote Share this post Link to post Share on other sites
bisqit999 0 #3 March 23, 2007 hehe, you said log! Quote Share this post Link to post Share on other sites
kbordson 8 #4 March 23, 2007 Quoteso x is 5^(-1/4) (edited to fix typos) Kick ass!!! Makes sense, easy to follow. Quote Share this post Link to post Share on other sites
billeisele 122 #5 March 23, 2007 my mind wandered at the "we invert" partGive one city to the thugs so they can all live together. I vote for Chicago where they have strict gun laws. Quote Share this post Link to post Share on other sites
skydemon2 0 #6 March 23, 2007 The answer is always 6Beauty is only skin deep, but ugly goes clean to the bone! I like to start my day off with a little Ray of Soulshine™!! Quote Share this post Link to post Share on other sites
TrophyHusband 0 #7 March 23, 2007 the answer ends up being 1/square root of 5. i kept coming up with 1/25 because for some reason i was trying to make2/-4=-2 instead of -1/2. i kept making the same stupid mistake repeatedly. i ate dinner and when i came back i got it right the first time. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
Squeak 17 #8 March 23, 2007 42You are not now, nor will you ever be, good enough to not die in this sport (Sparky) My Life ROCKS! How's yours doing? Quote Share this post Link to post Share on other sites
BIGUN 1,053 #9 March 23, 2007 That is just so damn sexy.Nobody has time to listen; because they're desperately chasing the need of being heard. Quote Share this post Link to post Share on other sites
Butters 0 #10 March 24, 2007 QuoteI use underscore to denote subscripts, so log_5 specifies that 5 is the subscript, just for clarity, although I'm sure you would've understood what I meant anyway. And ^ denotes power. So here goes: 2^(1/log_5 (x)) = 1/16 notice that 1/16 is actually 1/2^4 so it's actually 2^(-4) 2 raised to that mess is equal to 2 raised to the power -4, which means big mess equals -4 i.e. (1/log_5(x)) = -4 so when we invert the fraction we get log_5 (x) = -1/4 so x is 5^(-1/4) (edited to fix typos) Is it wrong that I actually enjoyed reading this post? "That looks dangerous." Leopold Stotch Quote Share this post Link to post Share on other sites
kbordson 8 #11 March 24, 2007 Quotethe answer ends up being 1/square root of 5. i kept coming up with 1/25 because for some reason i was trying to make2/-4=-2 instead of -1/2. i kept making the same stupid mistake repeatedly. i ate dinner and when i came back i got it right the first time. Are you sure it's one over the square root of 5.... I've done it a couple times again... and still agree with SuperGirl that I think it's one over the fourth root of 5. Quote Share this post Link to post Share on other sites
TrophyHusband 0 #12 March 24, 2007 i'm pretty sure. i came up with that a couple of times and it matches the answer in the back of the book, but i did find a wrong answer in the book once before. i don't have time now but i'll do it again later and see what's going on. maybe kallend or bill von will weight in and settle it for us. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
jcd11235 0 #13 March 24, 2007 QuoteQuotethe answer ends up being 1/square root of 5. i kept coming up with 1/25 because for some reason i was trying to make2/-4=-2 instead of -1/2. i kept making the same stupid mistake repeatedly. i ate dinner and when i came back i got it right the first time. Are you sure it's one over the square root of 5.... I've done it a couple times again... and still agree with SuperGirl that I think it's one over the fourth root of 5. I was confident SuperGirl was correct, but to be sure, I plugged it into my trusty TI-89. The result was indeed 5^(-1/4).Math tutoring available. Only $6! per hour! First lesson: Factorials! Quote Share this post Link to post Share on other sites
kbordson 8 #14 March 24, 2007 I think the four comes from Quotenotice that 1/16 is actually 1/2^4 so it's actually 2^(-4) If it were 1/2^2, that would only give 1/4 not the 1/16 Quote Share this post Link to post Share on other sites
JENNR8R 0 #15 March 24, 2007 Shouldn't this thread be in one of the foreign language forums? What do you call a beautiful, sunny day that comes after two cloudy, rainy ones? -- Monday. Quote Share this post Link to post Share on other sites
TrophyHusband 0 #16 March 24, 2007 ok. i screwed you guys and wrote down the problem wrong. the problem is 2^(2/log_5 X)=1/16. sorry. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
kbordson 8 #17 March 24, 2007 Quoteok. i screwed you guys and wrote down the problem wrong. the problem is 2^(2/log_5 X)=1/16. sorry. *Sigh...... ok, we forgive you. (but Supergirl was still right) Quote Share this post Link to post Share on other sites
TrophyHusband 0 #18 March 25, 2007 yes she was. i have another problem if you're up for it. this time i don't need an answer though, i need to know what i'm doing wrong. my math final is on wednesday and i really need to work out the bugs. Find a polynomialof degree 3 with constant coefficient 12 and zeros -1/2, 2, and 3. it sounds simple enough. (x+1/2)(x-2)(x-3)=x^3-9/2x^2+7/2x+3 multiply that whole mess by 4 and you get 4x^3-18x^2+14x+12 seems to me that the requirements are satisfied, but the answer given is 4x^3-18x^2+14x-12 i tried it several times and can't for the life of me figure out why the 12 is negative and not positive. i wrote it off as a typo in the book until i ran across the exact same issue on a practice test the instructor gave us to take home. obviously i'm missing something, i just don't know what it is. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
eddytheeagle 0 #19 March 25, 2007 You aren't doing anything wrong. The answer of the book has constant coefficient -12, instead of 12, and on top of that, it has only one real zero... so like you said, the answer in the book is wrong...Don't underestimate your ability to screw up! Quote Share this post Link to post Share on other sites
kbordson 8 #20 March 25, 2007 worked through it... (x + 1/2) (x - 2) (x - 3) (x^2 -2x + 1/2x -1) (x-3) (x^2 - 3/2x -1) (x-3) x^3 - 3/2x^2 - x - 3x^2 + 9/2x + 3 x^3 - 9/2 x^2 + 7/2 x + 3 Multiply by 12 4x^3 - 18x^2 + 14x + 12 I'm getting positive. Quote Share this post Link to post Share on other sites
TrophyHusband 0 #21 March 25, 2007 i agree with you, and even if there was a way for the answer in the book to be correct, my answer still satisfies the conditions. see response to boxdoc bordson's post for another just like it. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
TrophyHusband 0 #22 March 25, 2007 i really got thrown when doing a problem that the intructor gave us. its the same type of problem and there is the same discrepancy. Find a polynomial with integer coefficiantsnthat satisfied the given conditions: degree of 3 and zeros of -3, 1+i, and 1-i. the answer he gave is x^3+x^2-4x-6 the answer i get is x^3+x^2-4x+6 without even multiplying the whole mess out you can see that you will be multipying 2 negatives and 1 positive to get the constant. this will result in a positive constant. wtf? its difficult for me to believe that on the same day i can find both the text book and my instructor to be wrong concerning the exact same type of problem. stranger things have happened though. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
freeflir29 0 #23 March 25, 2007 I got a B- in my math class. I have now dumped all mathmatical knowledge beyond what I need to know to keep money in my pocket. Quote Share this post Link to post Share on other sites
TrophyHusband 0 #24 March 25, 2007 i would like to dump it, but i have to take calculus. i don't mind math much, its english i hate. "Your scrotum is quite nice" - Skymama www.kjandmegan.com Quote Share this post Link to post Share on other sites
freeflir29 0 #25 March 25, 2007 Quotebut i have to take calculus My condolences. Quote Share this post Link to post Share on other sites
