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a). 4 (3a + 7b) - 6(3a + 7b)
= 12a + 28b - 18a - 42b
= -6a - 14b
b) 4(2a - 3b)² + 8(2a - 3b)
(a - b)² = a² + b² -2ab.
Here, a = 2a , b = 3b, (2a - 3b)² = 4a² + 9b² - 12ab
= 4 ( 4a² + 9b² - 12ab) + 16a - 24b
= 16a² + 36b² - 48ab + 16a - 24b
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