Răspuns:
x²+5x+4=0
a=1
b=5
c=4
∆=b²-4ac
∆=5²-4•1•4
∆=25-16
∆=9
x1;x2= b-√∆/2=5-√9/2=5-3/2=2/2=1
x1;x2=b+√∆/2=5+√9/2=5+3/2=8/2=4
==> x1=1,iar x2=4
.
Succes!
