use the difference of two squares yule.
2(4x2 + 6x - 1)
4x2-8x-5 (2x+1)(2x-5)
(x + 1)(x - 2)(x + 5)
(x-2)(x+1)(x+5)
4x2 - 9y Not factorable from what I see.
The GCF is 4x2.
(2x + 1)(2x + 1) or (2x + 1)2
4x2-y2 = (2x-y)(2x+y)
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
4x2-36x+81 (2x-9)(2x-9)
4x2 - 23xy + 15y2 = (4x - 3y)(x - 5y)
4x2+20x+25 (2x+5)^2