(2x-1)²-(2x-1)*(1+2x)-(2x+1)²= 4x²-4x+1-(2x+4x²-1-2x)-(4x²+4x+1)= 4x²-4x+1-2x-4x²+1+2x-4x²-4x-1= -4x²-8x+1= -4*(√2)²-8*√2+1= -8√2-7
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(2x - 1)² - (2x - 1)(1 + 2x) - (2x + 1)² = 4x² - 4x +1 - (4x² -1) - (4x² + 4x + 1) =
4x² - 4x +1 - 4x² + 1 - 4x² - 4x - 1 = -4x² - 8x + 1
-4x² - 8x + 1 = -4 * (√2)² - 8 * √2 + 1 = - 4 * 2 - 8√2 + 1 = -8 - 8√2 + 1 = - 7 - 8√2