Question

x² + 4x = 1 - x² Qual a resposta ?

Answer 1

x²+4x=1-x²

x²+4x-1+x²=0

2x²+4x-1=0

-(+4)√16-4x2x(-1)

-4⁺₋4:4= x¹ = -4+4=0 ⇒ 0:4=0

x²= -4-4=-8 ⇒ -8:4=-2