High School · Reasoning with Equations and Inequalities

CCSS.MATH.CONTENT.HSA.REI.B.4

Solve quadratic equations in one variable.

Read this standard on the official Common Core site

Lessons that teach this standard

• Completing the Square, Step by Step

  Learn completing the square: why the method works geometrically, how to handle a leading coefficient, and how it produces vertex form and the quadratic formula.

• The Quadratic Formula: How and Why It Works

  Learn the quadratic formula, where it comes from, and how to use it to solve any quadratic equation, with worked examples and practice problems.

• Solving Quadratic Equations by Factoring

  Solve quadratics by factoring using the zero product property, why the equation must equal zero first, and how to factor the common trinomial patterns.