-12x2 +19x -4 = 0
ax2 bx c = 0
a = -12
b = 19
c = -4
Δ = b2-4ac
Δ = 19² - (4 * -12 * -4)
Δ = 361 - (4*48)
Δ = 361 - (192)
Δ = 169 Δ > 0
-12x2+19x-4=0
x = -b ∓ √Δ 2a
x' = -19 - √169 2*-12 = -19 - 13.0 -24 = -32.0 -24 = 1.33333333333
x" = -19 + √169 2*-12 = -19 + 13.0 -24 = -6.0 -24 = 0.25
x' = 192.0
x" = 36.0
S = {x ∈ R / x' = 192.0, x" = 36.0 }