1/(x-2) + 1/(x+2) = 6/5
[(x+2)+(x-2)]/[(x+2)(x-2)] = 6/5
(2x)/(x²-4) = 6/5
2x = (6x²-24)/5
0 = (6x²-24-10x)/5
0 = 6x²-10x-24 polinôme du second degré
discriminant:
delta = b²-4*a*c
delta = (-10)²-4*6*(-24)
delta = 100+576
delta = 676
racine de delta = (V(delta)) = (V(676)) = 26
les 2 solutions de l´équations 0 = 6x²-10x-24 sont donc:
x1 = (-b-V(delta))/(2*a)
x1 = (10-26)/(2*6)
x1 = -16/12
x1 = -4/3
x2 = (-b+V(delta))/(2*a)
x2 = (10+26)/(2*6)
x2 = 36/12
x2 = 3
donc les solutions sont: {-4/3 ; 3}