Szczegółowe wyjaśnienie:
(a+2)*6=
[tex] {6a }^{2} + 12a = 3a(2a + 4) \\ \frac{3a(2a + 4)}{3} = {2a }^{2} + 4 \\ \\ {(2a}^{2} + 4) \times 5b = {10a}^{2} b + 20b = 10ab(a + 2) \\ \\ \frac{10ab(a + 2)}{( - 2)} = - {5a}^{2} b - 10ab \\ \\ (a + 2)( - 5)ab = { - 5a}^{2} b - 10ab[/tex]
