x/x+1 + 2x/x-1=15/4 si lo pueden explicar mejor :)
x/x+1 + 2x/x-1=15/4
(x^2-x+2x^2+2x)/(x^2-1)=15/4
4(3x^2+x)=15(x^2-1)
3x^2-4x-15=0
3x 5
x -3
(3x+5)(x-3)=0
3x+5=0-->x=-5/3
x-3=0-->x=3
x=3 ó x=-5/3
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x/x+1 + 2x/x-1=15/4
(x^2-x+2x^2+2x)/(x^2-1)=15/4
4(3x^2+x)=15(x^2-1)
3x^2-4x-15=0
3x 5
x -3
(3x+5)(x-3)=0
3x+5=0-->x=-5/3
x-3=0-->x=3
x=3 ó x=-5/3