Răspuns :
delta =81-4x20=1
x1=-9+1/2=-4
x2=-9-1/2=-5
xpatrat+9x+20=(x+4)(x+5) care sunt numere consecutive
x1=-9+1/2=-4
x2=-9-1/2=-5
xpatrat+9x+20=(x+4)(x+5) care sunt numere consecutive