X compus cu y = xy-5x-5y+30
Rezollvati ecuatia x compus cu x =x


Răspuns :

x°x=x*x-5x-5x+30=x
x²-10x-x+30=0
x²-11x+30=0
DeerminantulΔ=1>0
x1=5   x2=6