7x2 -4x -5x2 +2x = 2x2 -2x
(2x-1)(2x-1) = 4x^2 -4x + 1
(2x - 1)(2x + 5)
There is no rational factorisation.
(2x - 9)(2x - 9) or (2x - 9)2
2x(2x - 1)
(4x - 3)(2x + 3)
(2x - 1)(4x + 1)
It is: 4x squared
(2x - 1)(2x + 1)
OK. 4x2 + 4x + 1 = (2x + 1)2
8x^2 + 6x - 5 = 8x^2 + 10x - 4x - 5 = 2x * (4x + 5) - (4x + 5) = (2x -1) * (4x + 5)