-4x2 +17x -13 = 0
ax2 bx c = 0
a = -4
b = 17
c = -13
Δ = b2-4ac
Δ = 17² - (4 * -4 * -13)
Δ = 289 - (4*52)
Δ = 289 - (208)
Δ = 81 Δ > 0
-4x2+17x-13=0
x = -b ∓ √Δ 2a
x' = -17 - √81 2*-4 = -17 - 9.0 -8 = -26.0 -8 = 3.25
x" = -17 + √81 2*-4 = -17 + 9.0 -8 = -8.0 -8 = 1.0
x' = 52.0
x" = 16.0
S = {x ∈ R / x' = 52.0, x" = 16.0 }