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Alleteodora
a fost răspuns

descompuneti in factori

25x ^2 -(2x+1)^2

25(3x+1)^2-4x^2

4(x-5)^2-(2x+3)^2

Răspuns :

StanciuGabriela29
1. (5x-2x-1)(5x+2x+1) 
2. [5(3x+1)-2x][5(3x+1)+2x]
3. [2(x-5)-(2x+3)][2(x-5)+(2x+3)]