Odpowiedź :
a)
(x - 5)² - (x + 5)² =
= x² - 10x + 25 - (x² + 10x + 25) =
= x² - 10x + 25 - x² - 10x - 25 = -20x
b)
(4x + 1)² - (2x - 1)² =
= 16x² + 8x + 1 - (4x² - 4x + 1) =
= 16x² + 8x + 1 - 4x² + 4x - 1 = 12x² + 12x
a)
(x - 5)² - (x + 5)² =
= x² - 10x + 25 - (x² + 10x + 25) =
= x² - 10x + 25 - x² - 10x - 25 = -20x
b)
(4x + 1)² - (2x - 1)² =
= 16x² + 8x + 1 - (4x² - 4x + 1) =
= 16x² + 8x + 1 - 4x² + 4x - 1 = 12x² + 12x