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a (2a - 4b) + 3b (2a -4b)
2a² - 4ab + 6ab - 12b²
2a² + 2ab - 12b²
,
b. (3k-5) (k² + 2k - 6)
3k (k² + 2k - 6) - 5 (k² + 2k - 6)
3k³ + 6k² - 18k - 5k² - 10k + 30
3k³ + 6k² - 5k² - 18k - 10k + 30
3k³ + k² - 28k + 30