4c²-b²-2c+b=(2c+b)(2с-b)-(2c-b)=(2c-b)(2c+b-1)
4c^2-b^2-2c+b=(4c^2-b^2)-(2c-b)=(2c-b)(2c+b)-(2c-b)=(2c-b)(2c+b-1)
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4c²-b²-2c+b=(2c+b)(2с-b)-(2c-b)=(2c-b)(2c+b-1)
4c^2-b^2-2c+b=(4c^2-b^2)-(2c-b)=(2c-b)(2c+b)-(2c-b)=(2c-b)(2c+b-1)