Dancin'Droid Posted November 17, 2014 Share Posted November 17, 2014 I am working on advanced functions homework (pre calc) and I am stuck on a question involving rational equations. I was wondering if someone could help with the answer. 1/x - 4 = 1/x+2 If you could show the solution that would be great. Link to comment Share on other sites More sharing options...
FramingDragon Posted November 17, 2014 Share Posted November 17, 2014 There's a homework help thread Link to comment Share on other sites More sharing options...
Ice T Posted November 17, 2014 Share Posted November 17, 2014 I don't have enough time to show you everything, but you should check out this: https://www.khanacademy.org/ It really helped me through university when things got rough Link to comment Share on other sites More sharing options...
GoaltenderInterference Posted November 17, 2014 Share Posted November 17, 2014 Is the answer "no solution"? I haven't done this in awhile. Don't judge. Link to comment Share on other sites More sharing options...
Where's Wellwood Posted November 17, 2014 Share Posted November 17, 2014 is that 1/(x + 2) or (1/x) + 2? Link to comment Share on other sites More sharing options...
Brick Tamland Posted November 17, 2014 Share Posted November 17, 2014 There is an app that you can take photos of questions and it will return answers. Link to comment Share on other sites More sharing options...
Brick Tamland Posted November 17, 2014 Share Posted November 17, 2014 is that 1/(x + 2) or (1/x) + 2? It was definitely not written down properly. Link to comment Share on other sites More sharing options...
drummer4now Posted November 17, 2014 Share Posted November 17, 2014 Is the answer "no solution"? I haven't done this in awhile. Don't judge. If only it was that simple every time... Link to comment Share on other sites More sharing options...
Dancin'Droid Posted November 17, 2014 Author Share Posted November 17, 2014 is that 1/(x + 2) or (1/x) + 2? 1/(x+2) Link to comment Share on other sites More sharing options...
NatureBoy Posted November 17, 2014 Share Posted November 17, 2014 The answer is 37½ Link to comment Share on other sites More sharing options...
Tortorella's Rant Posted November 17, 2014 Share Posted November 17, 2014 Looks painfully uninteresting to me. Good luck! Link to comment Share on other sites More sharing options...
NightHawkSniper Posted November 17, 2014 Share Posted November 17, 2014 Looks like you need a common denominator then quadratic formula. (try x(x+2)) If this is how you were asking easiest thing to do is check on wolfram alpha http://www.wolframalpha.com/input/?i=(1%2Fx)-4%3D1%2F(x%2B2) Link to comment Share on other sites More sharing options...
GoaltenderInterference Posted November 17, 2014 Share Posted November 17, 2014 1/(x+2)Well that changes everything.Nevermind. Wolfram Alpha says I'm wrong. LOL Link to comment Share on other sites More sharing options...
KFBR392 Posted November 17, 2014 Share Posted November 17, 2014 X=pie Xpie. Link to comment Share on other sites More sharing options...
GoaltenderInterference Posted November 17, 2014 Share Posted November 17, 2014 1/x - 4 = 1/(x+2)1/x - 1/(x+2) = 4(x+2-x)/[x(x+2)] = 42 = 4x2 + 8x4x2 + 8x - 2 = 02(2x2 + 4x -1) = 0Stick 2x2 + 4x - 1 = 0 into Quadratic equationI THINK that's right. It matches Wolfram Alpha.EDIT: I think I screwed up a sign, but it's sort of right. Link to comment Share on other sites More sharing options...
Toews Posted November 17, 2014 Share Posted November 17, 2014 1/x - 4 = 1/(x+2) 1/x - 1/(x+2) = 4 (x+2-x)/[x(x+2)] = 4 2 = 4x2 + 8x 4x2 + 8x - 2 = 0 2(2x2 + 4x -1) = 0 Stick 2x2 + 4x - 1 = 0 into Quadratic equation I THINK that's right. It matches Wolfram Alpha. EDIT: I think I screwed up a sign, but it's sort of right. You are correct. OP whenever you have a problem of this nature, try to get all the unknowns out of the denominator. 1/x - 4 = 1/(x+2) (1/x-4)(x+2) = 1 USE FOIL on the left hand side of the equation 1+2/x-4x-8 = 1 2/x-4x-8=0 There is only one term with x in the denominator so multiply by x and you will get the quadratic equation which goaltender interference posted. Use the quadratic equation formula to solve given by: x=[-b(+ or -) root(b^2-4ac)]/2a Link to comment Share on other sites More sharing options...
GoaltenderInterference Posted November 17, 2014 Share Posted November 17, 2014 You are correct.This makes me feel so much better. Good luck, OP. Link to comment Share on other sites More sharing options...
-AJ- Posted November 17, 2014 Share Posted November 17, 2014 I got X = 0. Guess I'm rusty. Link to comment Share on other sites More sharing options...
MikeyBoy44 Posted November 17, 2014 Share Posted November 17, 2014 The answer is 42 Link to comment Share on other sites More sharing options...
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