Learning goals: Teacher Facing Calculate complex solutions using the quadratic formula and represent them in the form $c \pm di$, where $c$ and $d$ are real numbers. Explain reasoning and critique the reasoning of others when solving quadratic equations. Explain when solutions are non-real when using the quadratic formula. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg2.3 Complex Numbers and Rational Exponents, Algebra 2.