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= 2(2a + 3)(4a) + 2(2a + 3)(2a - 2) + 2(4a)(2a - 2)
= 2(8a² + 12a) + 2(4a² + 2a - 6) + 2(8a² - 8a)
= 16a² + 24a + 8a² + 4a - 12 + 16a² - 16a
= 16a² + 16a² + 8a² + 24a + 4a - 16a - 12
= (40a² + 12a - 12) cm