Learning goals: Teacher Facing Coordinate and compare (orally and in writing) solutions to quadratic equations obtained by completing the square and those obtained by graphing. Understand that the “plus-minus” symbol is used to represent both square roots of a number and that the square root notation expresses only the positive square root. Use radical and “plus-minus” symbols to express solutions to quadratic equations. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg1.7 Quadratic Equations, Algebra 1.