⚠ 4x is read as the product 4*x: for a power, write 4^x Let's solve in ℝ: 4x2 + x + 5 = 0 Given the quadratic form ax2 + bx + c, let's compute the discriminant: Δ = b2 -4ac Δ = 1 -4·4·5 Δ = 1 -16·5 Δ = 1 -80 Δ = -79 Since Δ < 0, the equation has no solution. Could not solve in ℝ for: x ▶Solution: x ∈ ∅