Question

X elevado a 2 + x = 20

Answer 1

x²+x=20
x²+x-20=0

∆=1²-4.1.(-20)
∆=1+80
∆=81

x= -1±√81/2.1
x= -1±9/2
x1= -1+9/2=8/2=4
x2= -1-9/2=-10/2=-5