-4x2 +13x -10 = 0
ax2 bx c = 0
a = -4
b = 13
c = -10
Δ = b2-4ac
Δ = 13² - (4 * -4 * -10)
Δ = 169 - (4*40)
Δ = 169 - (160)
Δ = 9 Δ > 0
-4x2+13x-10=0
x = -b ∓ √Δ 2a
x' = -13 - √9 2*-4 = -13 - 3.0 -8 = -16.0 -8 = 2.0
x" = -13 + √9 2*-4 = -13 + 3.0 -8 = -10.0 -8 = 1.25
x' = 32.0
x" = 20.0
S = {x ∈ R / x' = 32.0, x" = 20.0 }