Question

equações do 2° grau, resolva:
a) 2x2 – 5x + 3 = 0
b) – x2 + 3x – 2 = 0
c) 4x2 – 8x + 4 = 0
d) x2 – 5 = 0
e) 2x2 + 5x = 0

Answer 1

Resposta:

a) Sx = {1,3/2}

b) Sx={-2,-1}

c) Sx = {1,1}

d) x = $\pm\sqrt{5}$

e) Sx = {-5/2,0}

Explicação passo-a-passo:

2x^2 - 5x + 3=0

Delta = 25 - 24 = 1

(5 +- 1)/4

6/4 = 3/2

4/4 = 1

-x^2 + 3x - 2 = 0

S = -3; P = 2

x={-2,-1}

4x^2 - 8x + 4 = 0

x^2 - 2x + 1 =0

S = 2; P = 1

x = {1,1}

x^2 - 5 = 0

x^2 = 5

x = $\pm\sqrt{5}$

2x^2 + 5x = 0

x = 0

x = -5/2

Sx = {-5/2,0}