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= -16a - 6b + 4a + 9b
= -12a + 3b
2. -3(4k² - 5m² + m) - 2(m² + 4m² - 9m)
= -12k² + 15m² - 3m - 2m² - 8m² + 18m
= -12k² + 5m² + 15m
3. 5(3m² - 5m² + m) - 2 (m² + 4m² - 9m)
= 15m² - 25m² + 5m - 2m² - 8m² + 18m
= -10m² + 23m - 10m²
= -20m² + 23m
catatan : kuadrat = pangkat dua
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