wzory:
(a - b)² = a² - 2ab + b²
(a - b)(a + b) = a² - b²
(2a-1)² - (4a-1)(4a+1) = (2a)² - 2 * 2a * 1 + 1² - [ (4a)² - 1² ] =
4a² - 4a + 1 - (16a² - 1) = 4a² - 4a + 1 - 16a² + 1 = - 12a² - 4a + 2
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wzory:
(a - b)² = a² - 2ab + b²
(a - b)(a + b) = a² - b²
(2a-1)² - (4a-1)(4a+1) = (2a)² - 2 * 2a * 1 + 1² - [ (4a)² - 1² ] =
4a² - 4a + 1 - (16a² - 1) = 4a² - 4a + 1 - 16a² + 1 = - 12a² - 4a + 2