It is the opposite of Expanding The Brackets
To factorise is to find the numbers that divide into the original number by only using prime numbers. For example factorise 20 = 2 times 2 times 5
Look in an advanced maths book.Improved answer:-If the discriminant of the quadratic expression is less than zero then it's not possible to factor it.
a²-a = a(a-1)
Factorise fully is when brackets are involved in the equation
you do (245x)
to put into brackets
Type that into the Wolfram Alpha website. It's a maths website that will pretty much do anything to any maths function you require (e.g graph, factorise, integrate etc...) See related links for the website address - alternatively, Google "Wolfram Alpha" and it takes you straight there. Happy maths-ing!
7x2+49x-42 = 7(x2+7x-6)
It is: a(7a-8b)