FACTORISE(2X-5)^2-5(2X-5)-14
FACTORISE4(2X-4)^3-(2X-4)
Please write in upper/lower case. It's easier to read.
Here's an example to help you solve the given problems.
Factorize (x+2)^2-5(x+2)-14.
Keep the (x+2) as a single entity, say y=(x+2), then
(x+2)^2-4(x+2)-12
=y^2-4y-12
=(y-6)(y+2)
Now substitute y=x+2
=(x+2-6)(x+2+2)
=(x-4)(x+4)
=x^2-16