x²-10x+25=(x-5)^2........ 16a²-8a+1=(4a-1)^2...... 36a²b²+12ab+1=(6ab+1)^2......... x²+16x+64=(x+8)^2........ 64x²y²-16xy+1=(8xy-1)^2......... 1+18x+81x² =(1+9x)^2....... PS: Am folosit formulele de calcul prescurtat: (a+b)^2=a^2+2ab+b^2 si (a-b)^2= a^2-2ab+b^2
