Question

Me ajudem nessa 4x²-4x-1 = 4

Answer 1

Olá,

4x² - 4x - 1 = 4
4x² - 4x - 1 - 4 = 0
4x² - 4x - 5 = 0
Δ = (-4)² - 4*4*(-5)
Δ = 16 + 80
Δ = 96

x' = (-(-4) + √96)/2*4
x' = (4 + 4√6)/8
x' = [4(1 + √6)]/8
x' = (1 + √6)/2

x'' = (4 - 4√6)/8
x'' = (1 - √6)/2

S = {(1 + √6)/2, (1 - √6)/2}