-12x2 +7x +12 = 0
ax2 bx c = 0
a = -12
b = 7
c = 12
Δ = b2-4ac
Δ = 7² - (4 * -12 * 12)
Δ = 49 - (4*-144)
Δ = 49 - (-576)
Δ = 625 Δ > 0
-12x2+7x+12=0
x = -b ∓ √Δ 2a
x' = -7 - √625 2*-12 = -7 - 25.0 -24 = -32.0 -24 = 1.33333333333
x" = -7 + √625 2*-12 = -7 + 25.0 -24 = 18.0 -24 = -0.75
x' = 192.0
x" = -108.0
S = {x ∈ R / x' = 192.0, x" = -108.0 }