Question

Quanto é - X² + X + 12 = 0 ?​

Answer 1

-x²+x+12=0

a= -1

b=1

c=12

∆=b²-4ac

∆=1²-4.(-1).12

∆=1+48

∆=49

x= -b±√∆ / 2a

x= -1±√49 / 2.(-1)

x= -1±7 / -2

x₁= -1+7 / -2 = 6 / -2 = -3

x₂= -1-7 / -2 = -8 / -2 = 4