FACTORISATION USING GROUPING

Lastly, sometimes an expression can have more than four terms in it. For such cases, they would have to be factorised using the grouping method. Grouping is when you take the two similar expression and group them together. Note that this method could only be used for certain expressions. One example to illustrate this would be:

ax-5a+4x-20

= (ax-5a)+(4x-20)

= a(x-5)+4(x-5)

= (x-5)(a+4)

One final example for grouping would be:

(x+y)(a+b)-(y+z)(a+b)

= (a+b)((x+y)-(y+z))

= (a+b)(x+y-y-z)

= (a+b)(x-z)

Lets watch a short video explaining a little bit more about factorising using grouping.