Odpowiedź :
Hej!
a)
(5 + x)(2x + 7) =
= 10x + 35 + 2x² + 7x =
= 2x² + 17x + 35
b)
(8a - 3b)(5 + a) =
= 40a + 8a² - 15b - 3ab
c)
(2x - 3)(7 - 4x) =
= 14x - 8x² - 21 + 12x =
= -8x² + 26x - 21
Pozdrawiam! - Julka
Hej!
a)
(5 + x)(2x + 7) =
= 10x + 35 + 2x² + 7x =
= 2x² + 17x + 35
b)
(8a - 3b)(5 + a) =
= 40a + 8a² - 15b - 3ab
c)
(2x - 3)(7 - 4x) =
= 14x - 8x² - 21 + 12x =
= -8x² + 26x - 21
Pozdrawiam! - Julka