tolong bantu aku please

a.
[tex]2x - y \\ = 2({a}^{2} - 3a + 2) - (8a - {2a}^{2} - 5) \\ = {2a}^{2} - 6a + 4 - 8a + {2a}^{2} + 5 \\ = {4a}^{2} - 14a + 9[/tex]