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x + y = a² -3a + 2 + 8a -2a² -5
= -a² + 5a -3
soal b
2x -y = 2(a² -3a +2) -(8a-2a²-5)
= 2a² -6a + 4 -8a + a² + 5
= 3a² - 14a +9
soal c
5x + 2y = 5(a² -3a +2) + 2(8a-2a²-5)
= 5a² -15a +10 + 16a - 4a² - 10
= a² + a