-4x2 +17x -18 = 0
ax2 bx c = 0
a = -4
b = 17
c = -18
Δ = b2-4ac
Δ = 17² - (4 * -4 * -18)
Δ = 289 - (4*72)
Δ = 289 - (288)
Δ = 1 Δ > 0
-4x2+17x-18=0
x = -b ∓ √Δ 2a
x' = -17 - √1 2*-4 = -17 - 1.0 -8 = -18.0 -8 = 2.25
x" = -17 + √1 2*-4 = -17 + 1.0 -8 = -16.0 -8 = 2.0
x' = 36.0
x" = 32.0
S = {x ∈ R / x' = 36.0, x" = 32.0 }