Question

Quantos que da x²=x+12

Answer 1

x²=x+12
x²-x-12=0
∆= (-1)²-4.1.(-12)
∆=1+48
∆=49

x=-(-1)±√49÷2.1
x=1±7÷2
x¹=8÷2=4
x²=-6÷2=-3

S{4,-3}