-4x2 +17x -4 = 0
ax2 bx c = 0
a = -4
b = 17
c = -4
Δ = b2-4ac
Δ = 17² - (4 * -4 * -4)
Δ = 289 - (4*16)
Δ = 289 - (64)
Δ = 225 Δ > 0
-4x2+17x-4=0
x = -b ∓ √Δ 2a
x' = -17 - √225 2*-4 = -17 - 15.0 -8 = -32.0 -8 = 4.0
x" = -17 + √225 2*-4 = -17 + 15.0 -8 = -2.0 -8 = 0.25
x' = 64.0
x" = 4.0
S = {x ∈ R / x' = 64.0, x" = 4.0 }