-1x2 +7x -10 = 0
ax2 bx c = 0
a = -1
b = 7
c = -10
Δ = b2-4ac
Δ = 7² - (4 * -1 * -10)
Δ = 49 - (4*10)
Δ = 49 - (40)
Δ = 9 Δ > 0
-x2+7x-10=0
x = -b ∓ √Δ 2a
x' = -7 - √9 2*-1 = -7 - 3.0 -2 = -10.0 -2 = 5.0
x" = -7 + √9 2*-1 = -7 + 3.0 -2 = -4.0 -2 = 2.0
x' = 5.0
x" = 2.0
S = {x ∈ R / x' = 5.0, x" = 2.0 }