| 1) $$2a + b$$ |
$$2 cdot 1 + 1 = 2 + 1 = 3$$ |
$$2 cdot 2 + (-1) = 4 - 1 = 3$$ |
$$2 cdot (-2) + (-3) = -4 - 3 = -7$$ |
$$2 cdot (-1) + 1 = -2 + 1 = -1$$ |
| 2) $$2(a + b)$$ |
$$2 cdot (1 + 1) = 2 cdot 2 = 4$$ |
$$2 cdot (2 + (-1)) = 2 cdot (2 - 1) = 2 cdot 1 = 2$$ |
$$2 cdot (-2 + (-3)) = 2 cdot (-2 - 3) = 2 cdot (-5) = -10$$ |
$$2 cdot (-1 + 1) = 2 cdot 0 = 0$$ |
| 3) $$2a + b^2$$ |
$$2 cdot 1 + 1^2 = 2 + 1 = 3$$ |
$$2 cdot 2 + (-1)^2 = 4 + 1 = 5$$ |
$$2 cdot (-2) + (-3)^2 = -4 + 9 = 5$$ |
$$2 cdot (-1) + 1^2 = -2 + 1 = -1$$ |
| 4) $$2(a + b^2)$$ |
$$2 cdot (1 + 1^2) = 2 cdot (1 + 1) = 2 cdot 2 = 4$$ |
$$2 cdot (2 + (-1)^2) = 2 cdot (2 + 1) = 2 cdot 3 = 6$$ |
$$2 cdot (-2 + (-3)^2) = 2 cdot (-2 + 9) = 2 cdot 7 = 14$$ |
$$2 cdot (-1 + 1^2) = 2 cdot (-1 + 1) = 2 cdot 0 = 0$$ |
| 5) $$2(a + b)^2$$ |
$$2 cdot (1 + 1)^2 = 2 cdot 2^2 = 2 cdot 4 = 8$$ |
$$2 cdot (2 + (-1))^2 = 2 cdot (2 - 1)^2 = 2 cdot 1^2 = 2 cdot 1 = 2$$ |
$$2 cdot (-2 + (-3))^2 = 2 cdot (-2 - 3)^2 = 2 cdot (-5)^2 = 2 cdot 25 = 50$$ |
$$2 cdot (-1 + 1)^2 = 2 cdot 0^2 = 2 cdot 0 = 0$$ |
| 6) $$2a^2 + b$$ |
$$2 cdot 1^2 + 1 = 2 cdot 1 + 1 = 2 + 1 = 3$$ |
$$2 cdot 2^2 + (-1) = 2 cdot 4 - 1 = 8 - 1 = 7$$ |
$$2 cdot (-2)^2 + (-3) = 2 cdot 4 - 3 = 8 - 3 = 5$$ |
$$2 cdot (-1)^2 + 1 = 2 cdot 1 + 1 = 2 + 1 = 3$$ |
| 7) $$2(a^2 + b)$$ |
$$2 cdot (1^2 + 1) = 2 cdot (1 + 1) = 2 cdot 2 = 4$$ |
$$2 cdot (2^2 + (-1)) = 2 cdot (4 - 1) = 2 cdot 3 = 6$$ |
$$2 cdot ((-2)^2 + (-3)) = 2 cdot (4 - 3) = 2 cdot 1 = 2$$ |
$$2 cdot ((-1)^2 + 1) = 2 cdot (1 + 1) = 2 cdot 2 = 4$$ |
| 8) $$2a^2 + b^2$$ |
$$2 cdot 1^2 + 1^2 = 2 cdot 1 + 1 = 2 + 1 = 3$$ |
$$2 cdot 2^2 + (-1)^2 = 2 cdot 4 + 1 = 8 + 1 = 9$$ |
$$2 cdot (-2)^2 + (-3)^2 = 2 cdot 4 + 9 = 8 + 9 = 17$$ |
$$2 cdot (-1)^2 + 1^2 = 2 cdot 1 + 1 = 2 + 1 = 3$$ |