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 = -44.0 44 = -1.0
x" = -15 + √841 2*22 = -15 + 29.0 44 = 14.0 44 = 0.318181818182
x' = -484.0
x" = 154.0
S = {x ∈ R / x' = -484.0, x" = 154.0 }