Hej!
Zadanie 13 :
(x + 1)(x + 2)(x + 3) =
= (x² + 2x + x + 2)(x + 3) =
= (x² + 3x + 2)(x + 2) =
= x³ + 2x² + 3x² + 6x + 2x + 4 =
= x³ + 5x² + 8x + 4
(x - 2)(x + 5)(2x - 1) =
= (x² + 5x - 2x - 10)(2x - 1) =
= (x² + 3x - 10)(2x - 1) =
= 2x³ - x² + 6x² - 3x - 20x + 10 =
= 2x³ + 5x² - 23x + 10
Zadanie 14 :
(x - 4)(x + 1) =
= x² + x - 4x - 4 =
= x² - 3x - 4
(2x - 3) - (x + 2) =
= 2x - 3 - x - 2 =
= x - 5
Pozdrawiam! - Julka
