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2.(4a)2-2*4a*12+122=16a2-96a+144
3.(3p)2-2*3p*2q+(2q)2=9p2-12pq+4q2
4.(Pierwiastek 7-a)2-2P7a+a2=7-2P7a+a2
16a^2 - 96a +144
9p^2-12pg+4g^2
7-2√7a+a^2