(a-b)²=a²-2ab+b² inddinty use (1q)28²
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(28)^2
=(30-2)^2
=(30)^2-2(30)(2)+(2)^2
=900-120+4
=904-120
=784
=(30-2)^2
=(30)^2-2(30)(2)+(2)^2
=900-120+4
=904-120
=784
kuruish37:
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