(a+2)²-a(4-7a) = a²+4a+4-4a+7a² = 8a²+4
8*(-1,2)²+4 = 8*1,44+4 = 11,52+4 = 15,52
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(a+2)²-a(4-7a) = a²+4a+4-4a+7a² = 8a²+4
8*(-1,2)²+4 = 8*1,44+4 = 11,52+4 = 15,52