# Problem solving with expressions and formulae

I can use my knowledge of expressions and formulae to solve problems.

# Problem solving with expressions and formulae

I can use my knowledge of expressions and formulae to solve problems.

## Lesson details

### Key learning points

- Expressions can be used whenever you wish to generalise.
- This can be very useful when there is something you do not know and wish to calculate.
- Situations involving expressions can occur in a variety of contexts.

### Common misconception

When subtracting expression pupils forget to subtract both terms from the second espression.

Watch out for mistakes with negatives here. Pupils should find it much easier to re-write subtractions as additions of additive inverses and that way they only need to add.

### Keywords

Binomial - A binomial is an algebraic expression representing the sum of exactly two unlike terms.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

$$(x + 5)(x + 1)$$ -

$$x^2 + 6x + 5$$

$$(x + 5)(x - 1)$$ -

$$x^2 + 4x - 5$$

$$(x - 5)(x + 1)$$ -

$$x^2 - 4x - 5$$

$$(x - 5)(x -1)$$ -

$$x^2 - 6x + 5$$

$$(x + 2)^2$$ -

$$x^2 + 4x + 4$$

$$(x - 2)^2$$ -

$$x^2 -4x + 4$$