O sa notex XxY ca X*Y sa se inteleaga mai usor.
Poti scrie legea mai simplu astfel :
x*y=-x+y-x-y-2 = (factor comun) x(y-1)-1(y-1)-3 (factor comun) = (x-1)(y-1)-3
(x+2)*(2x-3)=5 <=> (x+2-1)(2x-3-1) -3 = 5 <=> (x+1)(2x-4)-8 = 0 =>
2x^2 -2x -12 = 0
Δ = 4-4*2*(-12) = 4+96 = 100 => √Δ= 10
x1 = (2-10)/4 = -8/4 = -2
x2 = (2+10)/4 = 12/4 = 3
