The Discriminant

b^2 - 4ac > 0 means 2 solutions
b^2 - 4ac = 0 means 1 solution
b^2 - 4ac < 0 means no real solutions

p.593 (41-47:odd) and p.596 (1-15:odd)

Use factoring, completing the square, or the quadratic formula to solve each quadratic equation.