I can use my knowledge of expressions and formulae to solve problems.
I can use my knowledge of expressions and formulae to solve problems.
Binomial - A binomial is an algebraic expression representing the sum of exactly two unlike terms.
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.
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$$(x + 5)(x + 1)$$ - $$x^2 + 6x + 5$$
$$(x + 5)(x - 1)$$ - $$x^2 + 4x - 5$$
$$(x - 5)(x + 1)$$ - $$x^2 - 4x - 5$$
$$(x - 5)(x -1)$$ - $$x^2 - 6x + 5$$
$$(x + 2)^2$$ - $$x^2 + 4x + 4$$
$$(x - 2)^2$$ - $$x^2 -4x + 4$$
