-4x2 +x +14 = 0
ax2 bx c = 0
a = -4
b = 1
c = 14
Δ = b2-4ac
Δ = ² - (4 * -4 * 14)
Δ = 1 - (4*-56)
Δ = 1 - (-224)
Δ = 225 Δ > 0
-4x2+x+14=0
x = -b ∓ √Δ 2a
x' = -1 - √225 2*-4 = -1 - 15.0 -8 = -16.0 -8 = 2.0
x" = -1 + √225 2*-4 = -1 + 15.0 -8 = 14.0 -8 = -1.75
x' = 32.0
x" = -28.0
S = {x ∈ R / x' = 32.0, x" = -28.0 }