Cześć!
Szczegółowe wyjaśnienie:
[tex](x + 1) {}^{2} - (x - 1) {}^{2} + (x + 2) {}^{2} + (2 - x) {}^{2} = 2 \cdot2x + x {}^{2} + 4x + 4 + 4 - 4x + x {}^{2} = 4x + x {}^{2} + 4x + 4 + 4 - 4x + x {}^{2} = 2x {}^{2} + 4x + 8[/tex]
