Răspuns:
Explicație pas cu pas:
[tex]\frac{4x}{x^{2} -1} + \frac{5}{x -1} - \frac{7}{x + 1} =[/tex]
[tex]\frac{4x}{(x+1)(x-1)} + \frac{5}{x -1} - \frac{7}{x + 1} =[/tex]
Amplificam fractiile:
[tex]\frac{4x}{(x+1)(x-1)} + \frac{5*(x+1)}{(x -1)(x+1)} - \frac{7*(x-1)}{(x + 1)(x-1)} =[/tex]
[tex]\frac{4x + 5*(x+1) - 7*(x-1) }{(x+1)(x-1)} =[/tex]
[tex]\frac{4x + 5x+5 - 7x+ 7}{(x+1)(x-1)} =[/tex]
[tex]\frac{2x+12}{(x+1)(x-1)} =[/tex]
[tex]\frac{2*(x+6)}{(x+1)(x-1)}[/tex]
