Odpowiedź:
4(x - 1)(x + 1) = 4(x² - x + x - 1) = 4(x² - 1) = 4x² - 4
(3x - 3)(2x + 2) - (4x + 4)(2 - x) = 6x² - 6x + 6x - 6 - (8x + 8 - 4x² - 4x) =
= 6x² - 6 - 8x - 8 + 4x² + 4x = 10x² - 4x - 14
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Odpowiedź:
4(x - 1)(x + 1) = 4(x² - x + x - 1) = 4(x² - 1) = 4x² - 4
(3x - 3)(2x + 2) - (4x + 4)(2 - x) = 6x² - 6x + 6x - 6 - (8x + 8 - 4x² - 4x) =
= 6x² - 6 - 8x - 8 + 4x² + 4x = 10x² - 4x - 14