Explicație pas cu pas:
[tex]a = {(x + 1)}^{2} - x(x + 2) = {x}^{2} + 2x + 1 - {x}^{2} - 2x = 1 \in \mathbb{N}[/tex]
[tex]b = {(x - 3)}^{2} - x(x - 6) = {x}^{2} - 6x + 9 - {x}^{2} + 6x = 9 \in \mathbb{N} [/tex]
[tex]m_{a} = \frac{a + b}{2} = \frac{1 + 9}{2} = \frac{10}{2} = 5 \\ [/tex]
[tex]m_{g} = \sqrt{ab} = \sqrt{1 \cdot 9} = \sqrt{9} = 3 \\ [/tex]
