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= (2a+4)² -3a(2a-1) -4a+3
= (2a + 4) (2a+4) -6a² + 3a - 4a + 3
= 4a² + 8a + 8a + 16 -6a² + 3a - 4a + 3
= -2a² + 15a +19
semoga membantumu .