-1x2 +16x +17 = 0
ax2 bx c = 0
a = -1
b = 16
c = 17
Δ = b2-4ac
Δ = 16² - (4 * -1 * 17)
Δ = 256 - (4*-17)
Δ = 256 - (-68)
Δ = 324 Δ > 0
-x2+16x+17=0
x = -b ∓ √Δ 2a
x' = -16 - √324 2*-1 = -16 - 18.0 -2 = -34.0 -2 = 17.0
x" = -16 + √324 2*-1 = -16 + 18.0 -2 = 2.0 -2 = -1.0
x' = 17.0
x" = -1.0
S = {x ∈ R / x' = 17.0, x" = -1.0 }