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(2x-1)²-((4x-2)(5x-1)
(2x-1)(2x-1) - 2(2x-1)(5x-1)
(2x-1)(2x-1) -(2x-1)(10x-2)
(2x-1)(2x-1-10x+2)
(2x-1)(-8x+1)
(2x-1)²-((4x-2)(5x-1)
(2x-1)(2x-1) - 2(2x-1)(5x-1)
(2x-1)(2x-1) -(2x-1)(10x-2)
(2x-1)(2x-1-10x+2)
(2x-1)(-8x+1)