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 Subject: Three Math Equations Category: Reference, Education and News > Homework Help Asked by: mreyland-ga List Price: \$6.50 Posted: 20 Jul 2006 08:13 PDT Expires: 21 Jul 2006 22:50 PDT Question ID: 748001
 ```I need answers to these three math questions. Directions: Find all the real solutions. 4/X = (9/5) - ((7X-4)/5X) (2X - 5)(X+1) = 2 and Directions: Simplify (3X-9Y) / (9y^2 - X^2)```
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 Subject: Re: Three Math Equations From: quocamus-ga on 20 Jul 2006 13:05 PDT
 ```First problem: 4/X = (9/5) - ((7X-4)/5X) 4 = 9X/5 - ((7X-4)/5) 20 = 9X - (7X-4) 20 = 9X - 7X - 4 24 = 2X X = 12 Second problem: (2X - 5)(X+1) = 2 2X^2 + 2X - 5X - 5 = 2 2X^2 - 3X - 7 = 0 Using the quadratic formula: X = (3 +/- sqrt((-3)^2 - 4*2*(-7))) / (2*2) X = (3 +/- sqrt(9+56)) / 4 X = (3 +/- sqrt(65)) / 4 Third problem: (3X-9Y) / (9Y^2 - X^2) = -3(3Y-X) / ((3Y+X)*(3Y-X)) = -3 / (3Y+X)```
 Subject: Re: Three Math Equations From: mreyland-ga on 21 Jul 2006 01:35 PDT
 `Did you not want to list this under the answer to the question?`
 Subject: Re: Three Math Equations From: tr1234-ga on 21 Jul 2006 07:57 PDT
 ```"Did you not want to list this under the answer to the question?" Only official Google Answers researchers are allowed to officially answer questions. The rest of us only get to post comments. Official researchers' names appear in blue; since quocamus does not, I presume he/she is not an official researcher. You can keep the question open until an official researcher officially posts an official answer, but if you're satisfied with what you get in the comments, I'm pretty sure you can close our your question. Were you to do so, though, I'd suggest double checking quocamus's work in the first question, 'cuz there's a mistake there in one of the early steps that resulted in the wrong answer to the problem...```
 Subject: Re: Three Math Equations From: mreyland-ga on 21 Jul 2006 10:03 PDT
 ```Yes, I know. When I was working the problem out that was the answer I kept getting, but if you go back and plug it in it doesn't work. I just can't for the life of me, figure out what the answer is.```
 Subject: Re: Three Math Equations From: thither-ga on 21 Jul 2006 10:33 PDT
 ```20 = 9X - (7X-4) 20 = 9X - 7X - 4 It should be 20 = 9X - 7X + 4 X = 8 Have a good day.```