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= 3a² - 2a - 5a + 1 - 4
= 3a² -7a - 3
2. 3(2p + 3q - 3r) - 2(2p-4q+3r)
= 6p+9q-9r -4p + 8q - 6r
= 2p + 17q - 15 r
3. 2x²-xy - 4x +9 - 3y - xy + 2y
= 2x² - 2xy -4x + 2y + 9