x^4 + 4x^2 + 3 = (u^2 - 4u + 4) + 4(u - 2) + 3 = u^2 - 4u + 4 + 4u - 8 + 3 = u^2 - 1. - AMAZONAWS 📅 March 6, 2026 👤 scraface Mar 06, 2026