Tuesday, November 22, 2011

Factorising algebraic expressions

This is a way of writing an algerbraic epression in two parts,one times the other.We do this by factorising numbers normally.

e.g 6 = 3x2 which are the two factors of 6 because they both divide into the number.

When factorising a sum you take out the highest commen factor in the sum which then goes outside the brackets and the remaining digits or letters go inside the brackets.This is called 'factorising' wh means writing it as a product of its factors.You find out what numbers divide into the sum,what factors of the sum can you use as the common factor?which numbers appears in both sections of the sum?

This is an example of how to work out an algerbraic expression

Now were going to show you another example explaining how to use two brackets when having x squared.

x squared+5+6

(x+3)(x+2)

x squared +2x+3x+6

=x squared+5x+6

2 comments:

  1. Well done - explaining algebra is always difficult - I think you did a great job of explaining the steps involved!

    Can you find any revision resources or exemplar videos to help people with this topic?

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  2. I agree. Good job.

    Maybe you could find something Mr S likes here: http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/

    GCSE standard but might be interesting to go a little deeper than Y8??

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