-4x2 -3x +1 = 0
ax2 bx c = 0
a = -4
b = -3
c = 1
Δ = b2-4ac
Δ = -3² - (4 * -4 * 1)
Δ = 9 - (4*-4)
Δ = 9 - (-16)
Δ = 25 Δ > 0
-4x2-3x+1=0
x = -b ∓ √Δ 2a
x' = 3 - √25 2*-4 = 3 - 5.0 -8 = -2.0 -8 = 0.25
x" = 3 + √25 2*-4 = 3 + 5.0 -8 = 8.0 -8 = -1.0
x' = 4.0
x" = -16.0
S = {x ∈ R / x' = 4.0, x" = -16.0 }