How do you factorise and know if it is a difference of two squares ?
1. First you need to learn how to recognise the form:
Difference of two square numbers. a2 - 36
(a2 is a square number and 36 is also a square number and you are getting the difference between them)
To factorise, you would need to be put in to a form of
(a+b) (a-b)
2. Two numbers of a and b in the bracket remains the same, but the one bracket is the sum (+) and the other is the difference (-).
For example: a2 - 36
Two numbers would be a and 6.
(a+6) (a-6) And one would be (+) and the other would be (-)
EL
Related Maths GCSE answers
All answers ▸A bag has 3 red balls and 5 green balls. I take out 2 balls, without replacing them. What is the probability of choosing at least one red ball? Give your answer to 3 decimal places.
A ball, dropped vertically, falls d metres in t seconds. d is directly proportional to the square of t. The ball drops 45 metres in the first 3 seconds. How far does the ball drop in the next 7 seconds?
Factorize x^2-x-20
Rearrange 2s = d/t to make t the subject.