-6x2 +19x -10 = 0
ax2 bx c = 0
a = -6
b = 19
c = -10
Δ = b2-4ac
Δ = 19² - (4 * -6 * -10)
Δ = 361 - (4*60)
Δ = 361 - (240)
Δ = 121 Δ > 0
-6x2+19x-10=0
x = -b ∓ √Δ 2a
x' = -19 - √121 2*-6 = -19 - 11.0 -12 = -30.0 -12 = 2.5
x" = -19 + √121 2*-6 = -19 + 11.0 -12 = -8.0 -12 = 0.666666666667
x' = 90.0
x" = 24.0
S = {x ∈ R / x' = 90.0, x" = 24.0 }