Solve x² = k (perfect squares)

What this lesson shows

Solve x squared equals 9. Most people say 3 straight away — and they are right, but they are only half right.

Try it yourself

Real questions from this lesson's worksheets — answers below each one.

1. Solve x² = 1. Fill in the missing value: x = ±___
   Show answer

   1
2. Solve x² = 1
   Show answer

   ±1
3. Solve x² = 1. Which is correct?
   Show answer

   ±1
4. If x² = 1, then x = 1 is the ONLY solution. True or False?
   Show answer

   False