Identities bingo

Exercise and reference answers

Clues and terms

1. Clue

   Equation true for all values of its variables.

   Item

   Identity

2. Clue

   May hold for only some values.

   Item

   Equation

3. Clue

   Expands to a2 + 2ab + b2.

   Item

   (a+b)2

4. Clue

   Expands to a2 - 2ab + b2.

   Item

   (a-b)2

5. Clue

   Factors into (a + b)(a - b).

   Item

   a2-b2

6. Clue

   Property used to verify these expansions.

   Item

   Distributive

7. Clue

   Writing an expression as a product.

   Item

   Factorising

8. Clue

   Identity used to square 119 quickly.

   Item

   (a+b+c)2

9. Clue

   Square cut into parts to picture an identity.

   Item

   Area model

Instructions

Read each clue and tap the term it describes.

Explanation