-17x2 +15x +2 = 0
ax2 bx c = 0
a = -17
b = 15
c = 2
Δ = b2-4ac
Δ = 15² - (4 * -17 * 2)
Δ = 225 - (4*-34)
Δ = 225 - (-136)
Δ = 361 Δ > 0
-17x2+15x+2=0
x = -b ∓ √Δ 2a
x' = -15 - √361 2*-17 = -15 - 19.0 -34 = -34.0 -34 = 1.0
x" = -15 + √361 2*-17 = -15 + 19.0 -34 = 4.0 -34 = -0.117647058824
x' = 289.0
x" = -34.0
S = {x ∈ R / x' = 289.0, x" = -34.0 }