Odpowiedź :
a)
[tex]x - 8y \\ \\ 4 - 8 \times ( - 1) = 4 + 8 = 12[/tex]
b)
3a² - b(5a + 8) = 3 × (-2)² - 6(5 × (-2) + 8) = 3 × 4 -6(-10 + 8) = 12 -6(-2) = 12 + 12 = 24
a)
[tex]x - 8y \\ \\ 4 - 8 \times ( - 1) = 4 + 8 = 12[/tex]
b)
3a² - b(5a + 8) = 3 × (-2)² - 6(5 × (-2) + 8) = 3 × 4 -6(-10 + 8) = 12 -6(-2) = 12 + 12 = 24