4x^2 - (2x - 0,5)^2 - 2x = 4x^2 - (4x^2 - 2x + 0,25) - 2x = 4x^2 - 4x^2 + 2x - 0,25 - 2x = - 0,25
(6a - 2b)^2 + 24ab = 36a^2 - 24ab + 4b^2 + 24ab = 36a^2 + 4b^2
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4x^2 - (2x - 0,5)^2 - 2x = 4x^2 - (4x^2 - 2x + 0,25) - 2x = 4x^2 - 4x^2 + 2x - 0,25 - 2x = - 0,25
(6a - 2b)^2 + 24ab = 36a^2 - 24ab + 4b^2 + 24ab = 36a^2 + 4b^2