2a(2a-3)- 3a² = 4a² -6a -3a² = 4*(-2)² -6*(-2)² -3*(-2)² = 4*4 -6*4 -3*4= 16-24-12= -20
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2a(2a-3)- 3a² = 4a² -6a -3a² = 4*(-2)² -6*(-2)² -3*(-2)² = 4*4 -6*4 -3*4= 16-24-12= -20