Question

ESCRAVA A EQUAÇÃO NA FORMA GERAL E RESOLVA:

B)-20=-X-X^2

Answer 1

x²+x -20=0

∆= 1²-4.1.(-20)

∆= 1+80

∆=81

x= - 1 +-√81/2.1

x1= -1+9/2=8/2=4

x2= -1-9= -10/2= -5