In this lesson, you learned how to:

• Use the radical and "plus-minus" symbols to represent solutions to quadratic equations.
• Explain why the plus-minus symbol is used when solving quadratic equations by finding square roots.

Here are the activities that helped you reach those goals:

• 9.5.1: Roots of Squares
  • In this activity, you found the area and side lengths of squares to explore square roots.
• 9.5.2: Solutions Written as Square Roots
  • In this activity, you solved quadratic equations that had radicals left in the solutions.
  • 9.5.2: Self Check
  • 9.5.2: Additional Resources
• 9.5.3: Finding Irrational Solutions by Completing the Square
  • In this activity, you solved quadratic equations by completing the square. You graphed the equations to find the approximate solutions using a graphing calculator.
  • 9.5.3: Self Check
  • 9.5.3: Additional Resources
• 9.5.4: Finding Exact Solutions
  • In this activity, you solved quadratic equations and used a calculator to approximate the actual solution(s).

After these activities, you completed the following practice:

• 9.5.5: Practice