Lessons for A.REI.B.4
Using the quadratic formulaIdentify a, b and c, substitute carefully, simplify the radical.Lesson
Completing the squareAdd and subtract the missing number, then rewrite.Lesson
The discriminantPositive gives two, zero gives one, negative gives none that are real.Lesson
The quadratic formulaOne formula that solves every quadratic, and where it comes from.Lesson
Solving quadratics with square rootsIf something squared equals a number, that something is plus or minus the root.Lesson
Solving quadratics by factoringIf a product is zero, at least one factor is zero, and this is why factoring solves equations.Lesson
Printable Worksheets
Using the quadratic formula worksheet (PDF)Printable worksheet with answer keyPreview
Completing the square worksheet (PDF)Printable worksheet with answer keyPreview
The discriminant worksheet (PDF)Printable worksheet with answer keyPreview
Solving quadratics with square roots worksheet (PDF)Printable worksheet with answer keyPreview
Solving quadratics by factoring worksheet (PDF)Printable worksheet with answer keyPreview