5x2 -17x +14 = 0
ax2 bx c = 0
a = 5
b = -17
c = 14
Δ = b2-4ac
Δ = -17² - (4 * 5 * 14)
Δ = 289 - (4*70)
Δ = 289 - (280)
Δ = 9 Δ > 0
5x2-17x+14=0
x = -b ∓ √Δ 2a
x' = 17 - √9 2*5 = 17 - 3.0 10 = 14.0 10 = 1.4
x" = 17 + √9 2*5 = 17 + 3.0 10 = 20.0 10 = 2.0
x' = 35.0
x" = 50.0
S = {x ∈ R / x' = 35.0, x" = 50.0 }