The numerator of this fraction will factorise as there is a common factor of 3.
This gives . Now, there is clearly a common factor of 3 between the numerator and denominator. Cancelling this through the fraction gives . There are no more common factors in this expression. Note cannot be cancelled as there is no term in the +2 in the numerator.
In this example, both the numerator and the denominator can be factorised. The numerator is a quadratic with no common factors which will therefore factorise into two brackets. The denominator does contain a common factor of 4 so will factorise into one bracket.
Factorise the numerator .
The numbers are +4 and +1 as and .
Factorise the denominator .
The highest common factor of and 16 is 4. Put this number in front of a bracket and then divide each term by 4 to complete the sum.
This gives .
The original expression was . Factorising gives .
There is a common factor throughout the fraction of . Cancelling out this factor will simplify the expression.