-4x2 +7x -3 = 0
ax2 bx c = 0
a = -4
b = 7
c = -3
Δ = b2-4ac
Δ = 7² - (4 * -4 * -3)
Δ = 49 - (4*12)
Δ = 49 - (48)
Δ = 1 Δ > 0
-4x2+7x-3=0
x = -b ∓ √Δ 2a
x' = -7 - √1 2*-4 = -7 - 1.0 -8 = -8.0 -8 = 1.0
x" = -7 + √1 2*-4 = -7 + 1.0 -8 = -6.0 -8 = 0.75
x' = 16.0
x" = 12.0
S = {x ∈ R / x' = 16.0, x" = 12.0 }