Odpowiedź:
a) (x+1)(x+2) = x² + 2x + 2 +x = x² + 2 + 3x
b) (3a + 4)(a - 5) = 3a? - 15a + 4a - 20 = 3a2 - 11a - 20
c) (2t + 1)(1-3t)= 2t - 6t? + 1- 3t = -1t 6t? + 1
d) (3ab - 7)(3 - 7ab)= 9ab 21a?b² - 21+ 49ab = 58ab - 21a?b? - 21
e) (-x + y)(5x + 6y)= -5x - 6xy + 5xy + 6y2=
-5x - xy + 6y?
f) (x + 5y)(7x - y)= 7x? - xy + 35 xy - 5y2= 7x2- 34xy - 5y?
g) (2x - y)(x* + y) = 2x® + 2x*y - x*y - y²= 2x + x*y - y?
h) (ab - a)(2ab + 6a) = 2a²b2 + 6a?b - 2a?b - 6a?= 6a'b - 6a?
Szczegółowe wyjaśnienie:
Bo tak
