A few days ago
Anonymous

Solve the following equation for the variable x?

6 / x-1 + 5 / x + 1 = 3x / x^2 – 1

Top 5 Answers
A few days ago
Anonymous

Favorite Answer

6/x-1 + 5/x+1 = 3x/x^2-1

6(x+1) / (x-1) (x+1) + 5(x-1) / (x+1) (x-1) = 3x/x^2-1

6(x+1) / x^2 – 1 + 5(x-1) / x^2 – 1 = 3x/x^2 – 1

6(x+1) + 5(x-1) = 3x

6x + 6 + 5x -5 = 3x

8x = -1

x = -1/8

i think it’s right

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A few days ago
USMCBabydoll
I am going to attempt to answer you however, the way you have written the right hand side of the equation is not clear. not sure if you mean 3x/(x^2-1) or (3x/x^2) -1. If it is the first one then (x^2-1) = (x+1)(x-1) which is what you need to multiple both sides by to get rid of the denominators. Once you have done that then you are left with:

6(x+1) +5(x-1) = 3x and you should be able to solve from there. Good luck

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A few days ago
pockethotrod
what you should do first is get rid of all the denominators:

the least common denominator is x^2 – 1

multiply 6 / x-1 by (x+1)/x+1) and you get 6(x+1)/x^2 – 1

multiply 5/ x+1 by (x-1)/(x-1) and you get 5(x-1)/x^2 – 1

then add the fractions together:

6(x+1)/x^2 – 1 and 5(x-1)/x^2 – 1 equals to [5(x-1)+6(x+1)]/x^2 – 1

[5(x-1)+6(x+1)]/x^2 – 1 subtract 3x / x^2 – 1 so: [5(x-1)+6(x+1)-3x]/x^2 – 1 = 0

expand:

(5x-5+6x+6-3x)/x^2 – 1

(8x+1)/x^2 – 1

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A few days ago
kirsty1995
is it 6/x-1+5/x+1 or 6/(x-1+5/x+1) or 6/(x-1)+5/(x+1)?
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4 years ago
?
you realize that x^2 – 9 could nicely be written as (x + 3) * (x – 3) so multiplicate the equation with (x+3)*(x-3): 4(x+3) + 6(x-3) = 2x 4x +12 +6x -18 = 2x 10x -6 = 2x 8x -6 = 0 8x = 6 x = 6/8 = 3/4 = 0.seventy 5
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