Question

Como resolvo esse sistema de 2 grau: {x² + y = 35
{y = 2x

Answer 1

x² + 2x= 35
x² + 2x -35=0


A= 1 b= 2 C=-35

Delta = b²-4.a.c
Delta = 4-4.1.(-35)
Delta= 4+140
Delta= 144

X=-b+- raiz Delta/2.a
X= -2+- raiz de 144/2.1
x=-2+-12/2

x1= -2 + 12/2 = 10/2 = 5


x2= -2-12/2 = - 14/2 = -7