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pl= 8a² + 12a
pt= (2a + 3)(2a -2)
pt= 4a²- 4a + 6a - 6
pt = 4a² + 2a - 6
lt= 4a (2a -2)
lt= 8a²- 8a
Lp = 2 (pl + pt + lt)
Lp = 2 ((8a² + 12a) + (4a² + 2a - 6) + (8a² - 8a))
Lp = 2 (8a² + 12a + 4a² + 2a - 6 + 8a² - 8a)
Lp = 2 (20a² + 6a - 6)
Lp = 40a² + 12a - 12