Question

a) x² + x – 12= 0 respondam​

Answer 1

Explicação:

∆=b²-4ac

∆=1²-4.1.(-12)

∆=1+48

∆=49

x=-b±√∆/2

x=-1±√49/2

x=-1±7/2

x1=-1+7/2

x1= 6/2

x1= 3

x2= -1-7/2

x2= -8/2

x2=-4