Common Core: A-REI.4a
Problem 17 of 18a1-017
Solve by completing the square. What are the real solutions?
Try it first
The walkthrough opens once you check an answer.
Solution walkthrough2:01
- Plan: make the left side a perfect square. First move the across: .
- Draw as an by square and two by strips. The missing corner is .
- Add to both sides to stay balanced. The left side is now a full square: .
- Take square roots, both signs: . Subtract : .
- Traps: added on one side only, added instead of , and a lost sign in .