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como el que pusiste
1) (12a+5)²= (12a+5)(12a+5) = 144a²+60a+60a+25 = 144a²+120a+25
2) (x+y)² = (x+y)(x+y) = x²+xy+xy+y² = x²+2xy+y²
3) (x-y)² = (x-y)(x-y) = x²-yx-yx+y² = x²-2yx+y²
No son 10 pero analizalas y veras como se resuelven