Hej!
(8x - 3)(4x + 7) =
= 32x² + 56x - 12x - 21 =
= 32x² + 44x - 21
(7 + 2x)(x - 12) =
= 7x - 84 + 2x² - 24x =
= 2x² - 17x - 84
(5 - 4x)(1 + 2x) =
= 5 + 10x - 4x - 8x² =
= -8x² + 6x + 5
Pozdrawiam! - Julka
