-12x2 -7x +5 = 0
ax2 bx c = 0
a = -12
b = -7
c = 5
Δ = b2-4ac
Δ = -7² - (4 * -12 * 5)
Δ = 49 - (4*-60)
Δ = 49 - (-240)
Δ = 289 Δ > 0
-12x2-7x+5=0
x = -b ∓ √Δ 2a
x' = 7 - √289 2*-12 = 7 - 17.0 -24 = -10.0 -24 = 0.416666666667
x" = 7 + √289 2*-12 = 7 + 17.0 -24 = 24.0 -24 = -1.0
x' = 60.0
x" = -144.0
S = {x ∈ R / x' = 60.0, x" = -144.0 }