19x2 -14x -5 = 0
ax2 bx c = 0
a = 19
b = -14
c = -5
Δ = b2-4ac
Δ = -14² - (4 * 19 * -5)
Δ = 196 - (4*-95)
Δ = 196 - (-380)
Δ = 576 Δ > 0
19x2-14x-5=0
x = -b ∓ √Δ 2a
x' = 14 - √576 2*19 = 14 - 24.0 38 = -10.0 38 = -0.263157894737
x" = 14 + √576 2*19 = 14 + 24.0 38 = 38.0 38 = 1.0
x' = -95.0
x" = 361.0
S = {x ∈ R / x' = -95.0, x" = 361.0 }