Question

qual e a resposta dessa equação 2x² - 8x + 8 =0 ?

Answer 1

2x² - 8x + 8 = 0 (:2)
x² - 4x + 4 = 0
a = 1; b = - 4; c = 4

Δ = b² - 4ac
Δ = (-4)² - 4.1.4
Δ = 16 - 16
Δ = 0

x = - b +/- √Δ = - (-4) +/- 0
         2a                 2.1

x = 4 + 0
        2

x = 4/2 = 2

Resp.: x = 2

Answer 2

2x²- 8x + 8 = 0
Δ = (-8)² -4*2*8
Δ = 64 - 64
Δ = 0
x = -(-8) +- √0 / 2*2
x1 = 8+0/4 = 2
x2 = 8-0 / 4 = 2

S = {2}