Question

Usando a formula de Bhaskara

responda> 4x²-4x-8=0

Answer 1

4 x² - 4 x - 8 = 0
Δ = b² - 4.a.c
Δ = (-4)² - 4 . 4 . -8
Δ = 16 + 128
Δ = 144 ⇒ √ 144 = 12
x = -b + ou - 12/2.a
x´= -(-4) + 12/2.4
x´= 4 + 12 / 8
x´= 16/8 ⇒ 2
x´´ = 4 - 12/8
x´´ = -8/8 ⇒ -1
S = { -1 ; 2 }