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= 7a² - 8a² -9 + 14
= - a² +5
b. = (x²-5x) - (-3x²-9x)
= x² + 3x² - 5x + 9x
= 4x² +5x
c. = (3p³-5p²+9p) - (-2p³+ 4p²-6p )
= 3p³ + 2p³ - 5p² - 4p² + 9p +6p
= 5p³ - 9p² + 15p