8. (За – 2b) - 10(за - 2b)^2
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=> 8(3a-2b)² - 10(3a - 2b)
= 8 [(3a)²-2(3a×2b)+(2b)²] -10(3a-2b)
= 8 [9a² - 12ab + 4b² ] - 10(3a - 2b)
= 72a² - 96ab + 32b² - 30a + 20 b
= ½[36 a² - 48ab + 16 b² - 15a + 10b]
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