-4x2 +15x -14 = 0
ax2 bx c = 0
a = -4
b = 15
c = -14
Δ = b2-4ac
Δ = 15² - (4 * -4 * -14)
Δ = 225 - (4*56)
Δ = 225 - (224)
Δ = 1 Δ > 0
-4x2+15x-14=0
x = -b ∓ √Δ 2a
x' = -15 - √1 2*-4 = -15 - 1.0 -8 = -16.0 -8 = 2.0
x" = -15 + √1 2*-4 = -15 + 1.0 -8 = -14.0 -8 = 1.75
x' = 32.0
x" = 28.0
S = {x ∈ R / x' = 32.0, x" = 28.0 }