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(2x-3)2+(2x+3)2-2(2x-3)(2x+3)=?

Răspuns :

4x2-12x+9+4x2+12x+9-8x2+18=9+9+18=18+18=36
(2x-3)²+(2x+3)²-2(2x-3)(2x+3)
se foloseste formula 
(a-b)²=a²-2ab+b²
se restrange in
[(2x-3)-(2x+3)]²=(2x-3-2x-3)²=(-6)²=36