Question

RESOLVA AS EQUAÇOES DO SEGUNDO GRAU ABAIXO:

A) X²+3X=0

B) 2X²-200=0

C) X²-2X=0

D) X²-4X=X​

Answer 1

A) x^2 + 3x = 0
3^3 - 4.1.0
9 - 0 = 9

x = -3 +ou- raiz de 9/2.1
x = -3 +ou- 3/2
x1 = 0
x2 = 3

B) 2x^2 - 200 = 0
200^2 - 4.4.0
400 - 0 = 40000

x = 200 +ou- raiz de 40000/2.2
x = 200 +ou- 200/4
x1 = 100
x2 = 0

C) x^2 - 2x = 0
-2^2 - 4.1.0
4 - 0 = 4

x = 2 +ou- raiz de 4/2.1
x = 2 + ou- 2/2
x1 = 2
x2 = 0

D) x^2 - 4x = 4
-4x^2 - 4.1.4
16 - 16 = 0

x = 4 +ou- raiz de 0/2.1
x = 4 +ou- 0/2
x1 = 2
x2 = 2