Răspuns:
Explicație pas cu pas:
a)
3x²-7x-10=0
x1,2=7±√49+120/12√=7±13/12
x1=20/12=5/3
x2=-6/12=-1/2
b)
9x²+4x-5=0
x1,2=-2±√4+45/9=-2±7/9
x1=-1
x2=5/9