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(x + 2/x - 1)+1 = x-2/x-5

if there is more than one solution write them all

2007-03-10 01:13:15 · 2 answers · asked by Anonymous in Science & Mathematics Mathematics

2 answers

The first important rule when finding x for this problem is that the denominator cannot be zero, so x≠1 or 5.

Multiply both sides by (x-1)(x-5):
(x+2)(x-5)+(x-1)(x-5)=(x-2)(x-1)
x^2-3x-10+x^2-6x+5=x^2-3x+2
2x^2-9x-5=x^2-3x+2

Subtract x^2, add 3x, and subtract 2 from both sides:
x^2-6x-7=0

Factor the equation:
(x+1)(x-7)=0
x=-1 and 7

Check:
(-1+2)/(-1-1)+1=(-1-2)/(-1-5)
-1/2+2/2=3/6
1/2=1/2

(7+2)/(7-1)+1=(7-2)/(7-5)
9/6+1=5/2
3/2+2/2=5/2
5/2=5/2

I hope this helps!

2007-03-10 02:19:00 · answer #1 · answered by Anonymous · 4 0

(x + 2/x - 1)+1 = x-2/x-5
we put (x-1)/(x-1) instead of 1 , so :
(x + 2/x - 1)+(x-1/x-1) = x-2/x-5
2x+1/x-1 = x-2/x-5
2x^2-9x-5 = x^2 -3x+2
x^2 -6x-7= 0
x has two answers :
x= -1 , x= 7

2007-03-10 01:25:06 · answer #2 · answered by Kiamehr 3 · 3 0

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