-15x2 +17x -2 = 0
ax2 bx c = 0
a = -15
b = 17
c = -2
Δ = b2-4ac
Δ = 17² - (4 * -15 * -2)
Δ = 289 - (4*30)
Δ = 289 - (120)
Δ = 169 Δ > 0
-15x2+17x-2=0
x = -b ∓ √Δ 2a
x' = -17 - √169 2*-15 = -17 - 13.0 -30 = -30.0 -30 = 1.0
x" = -17 + √169 2*-15 = -17 + 13.0 -30 = -4.0 -30 = 0.133333333333
x' = 225.0
x" = 30.0
S = {x ∈ R / x' = 225.0, x" = 30.0 }