Se aplica formula de calcul prescurtat (a-b)² = a²-2ab+b²
(25-x)² = 25²- 2*25*x+x² = x² =50x+625
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(25-x)^2=25^2-2•25•x+x^2= 625-50x+x^2
Nu pot scrie ridicarea la putere asa ca ^2= la puterea a doua
Se aplica formula de calcul prescurtat (a-b)² = a²-2ab+b²
(25-x)² = 25²- 2*25*x+x² = x² =50x+625