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2. 5ab - 3be - 7ab + 8be = 5ab - 7ab - 3be + 8be = -2ab + 5be
3. 18p² - 7p + 15q - 24q² - 30p² + 5p = 18p² - 30p² - 7p + 5p + 15q - 24q² = -12p² - 2p + 15q - 24q²
4. 22y - 3y + 4( 2y - 15y ) = 22y - 3y + 4 x -13y = 22y - 3y - 42y = -23y
5. 5.(6p² - 7q² ) - 6 ( p² + q² ) = (5).(6p²) + (5).(-7q²) + (-6).(p²) + (-6).(q²) = 30p² - 35q² -6p² -6q² = 30p² - 6p² -35q² -6q² = 24p² -41q²