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= a² - ab - b²+ bc - c²+ac
b. p²+p-3-p(p-2)+2p(3p+1)
= 2p² - p²+2p + 6p² +2p
= p² + 2p +6p² +2p
= (p²+ 6p²) + (2p+2p)
= 7p² + 4p
b. = 2P + P - 3 - P² + 2P + 6P² + 2P
= 2P + 2P + 2P + P - P² + 6P² - 3
= 6P + P + 5P² - 3