22x2 -15x -7 = 0
ax2 bx c = 0
a = 22
b = -15
c = -7
Δ = b2-4ac
Δ = -15² - (4 * 22 * -7)
Δ = 225 - (4*-154)
Δ = 225 - (-616)
Δ = 841 Δ > 0
22x2-15x-7=0
x = -b ∓ √Δ 2a
x' = 15 - √841 2*22 = 15 - 29.0 44 = -14.0 44 = -0.318181818182
x" = 15 + √841 2*22 = 15 + 29.0 44 = 44.0 44 = 1.0
x' = -154.0
x" = 484.0
S = {x ∈ R / x' = -154.0, x" = 484.0 }