Homework Help: pre calc

Posted by Muffy on Saturday, October 24, 2009 at 3:51pm.

Solve: (x+5/x)+(6/x-4)=(-7/x^2-4x)

I multiplied the entire function by x and x-4 and after doing that I got down to the quadratic equation
x^2+7x-13=0

I did the quadratic and got

x=1.525 and -8.525

I feel like I made a mistake because when I plug in both of those answers for x separately, it never works out. Not sure if I made an error in calculating or in plugging in, or if there is no solution.

Thanks.

pre calc - Thomas, Saturday, October 24, 2009 at 4:45pm
your answer is wrong.... redo the problem and move 1.5 and make it 5.125
pre calc - Muffy, Saturday, October 24, 2009 at 4:48pm
I'm not quite sure what you mean. Can you please elaborate
pre calc - jim, Saturday, October 24, 2009 at 5:26pm
Not sure you should go by me, because I took it down wrong the first time, but I got:

x + 11/x - 4 + 7/x^2 + 4x = 0

Gathering and multiplying by x^2:

5x^3 - 4x^2 + 11x + 7 = 0

Does this makes sense to you in the context of your course?

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