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2014-05-25T13:12:39+03:00
A = (x-2)² - 3(x-1)(x+1) + 2(x+3)² - 8x
a = x² - 4x + 4 - 3(x² +x - x -1) + 2(x² + 6x + 9) - 8x
a = x² - 4x + 4 - 3x² + 3 + 2x² + 12x + 18 - 8x
a = 0 + 0 + 25
a = 25 ∈ N

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