Let's solve in ℝ: x2 + 8x + 65 = 0 Given the quadratic form ax2 + bx + c, let's compute the discriminant: Δ = b2 -4ac Δ = 82 -4·1·65 Δ = 64 -4·65 Δ = 64 -260 Δ = -196 As Δ < 0, the equation has no solution. Could not solve in ℝ for: x ▶Solution: x ∈ ∅