-4x2 -x +3 = 0
ax2 bx c = 0
a = -4
b = -1
c = 3
Δ = b2-4ac
Δ = -² - (4 * -4 * 3)
Δ = 1 - (4*-12)
Δ = 1 - (-48)
Δ = 49 Δ > 0
-4x2-x+3=0
x = -b ∓ √Δ 2a
x' = 1 - √49 2*-4 = 1 - 7.0 -8 = -6.0 -8 = 0.75
x" = 1 + √49 2*-4 = 1 + 7.0 -8 = 8.0 -8 = -1.0
x' = 12.0
x" = -16.0
S = {x ∈ R / x' = 12.0, x" = -16.0 }