### Theory

 1 Abridged multiplication formulas 2 The square of the sum 3 The square of the difference 4 The difference of squares

### Exercises

 1 Check the correct answer using the formula Difficulty: easy 3 2 Application of the formula of the difference of squares Difficulty: easy 3 3 The square of the sum formula, polynomial squaring Difficulty: easy 3 4 The difference of squares formula Difficulty: easy 3 5 Formula of the square of the difference Difficulty: easy 3 6 Abridged multiplication formulas (statements) Difficulty: easy 3 7 Product of difference and sum (common fractions) Difficulty: medium 5 8 Difference of the squares (powers) Difficulty: medium 5 9 Difference of the squares (decimal fractions) Difficulty: medium 5 10 Product of sum and difference (integers) Difficulty: medium 5 11 Value of the expression Difficulty: medium 4 12 The square of the sum (decimal fractions) Difficulty: medium 5 13 The square of the difference (common fractions) Difficulty: medium 5 14 The square of the sum (trinomial) Difficulty: medium 5 15 The square of the difference (trinomial) Difficulty: medium 5 16 The difference of cubes Difficulty: medium 5 17 The square of the difference (multiplication by a number) Difficulty: medium 5 18 The product of the sum of two numbers by the incomplete square of their difference Difficulty: hard 8 19 Abridged multiplication formulas (decimal fractions) Difficulty: hard 8 20 The difference of squares (integers) Difficulty: hard 8 21 The product of sum and difference (numeric expression) Difficulty: hard 8

### Tests

 1 Training on polynomials Difficulty: medium 16

### Teacher manual

 1 Methodical recommendation