13x2 -16x +3 = 0
ax2 bx c = 0
a = 13
b = -16
c = 3
Δ = b2-4ac
Δ = -16² - (4 * 13 * 3)
Δ = 256 - (4*39)
Δ = 256 - (156)
Δ = 100 Δ > 0
13x2-16x+3=0
x = -b ∓ √Δ 2a
x' = 16 - √100 2*13 = 16 - 10.0 26 = 6.0 26 = 0.230769230769
x" = 16 + √100 2*13 = 16 + 10.0 26 = 26.0 26 = 1.0
x' = 39.0
x" = 169.0
S = {x ∈ R / x' = 39.0, x" = 169.0 }