(2x-5)²-2x(3x-1)
= (2x)² - 2*2x*5 + 25 - 2x*3x - 2x*(-1)
= 4x² - 20x + 25 - 6x² + 2x
= -2x² - 18x + 25
(2x+1)(3x-4)-(2x+1)²
= (2x+1) (3x-4 - (2x+1))
= (2x+1) (3x-4-2x-1)
= (2x+1) (x-5)
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(2x-5)²-2x(3x-1)
= (2x)² - 2*2x*5 + 25 - 2x*3x - 2x*(-1)
= 4x² - 20x + 25 - 6x² + 2x
= -2x² - 18x + 25
(2x+1)(3x-4)-(2x+1)²
= (2x+1) (3x-4 - (2x+1))
= (2x+1) (3x-4-2x-1)
= (2x+1) (x-5)