Factorise completely ( x − 4x^3)
(x-4x3) = x(1-4x2) Just taking a factor of x out of both terms Within the inner bracket we have a difference of two squares. 12=1 and (2x)2=4x2 therefore we can write x(1-4x2) = x(1-2x)(1+2x)
(x-4x3) = x(1-4x2) Just taking a factor of x out of both terms Within the inner bracket we have a difference of two squares. 12=1 and (2x)2=4x2 therefore we can write x(1-4x2) = x(1-2x)(1+2x)
