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Aplicind metoda gruparii termenilor ,descompuneti in factori ireductibili:
7x'4-9x'3-7x'2+9x
2)Restringeti
25x'2-10x+1


Răspuns :

a) 7x^4-7x^2-9x^3+9x= 7x^2(x^2-1)-9x(x^2-1)= (x^2-1)x(7x-9)= x(x-1)(x+1)(7x-9) b) 25x^2-10x+1=5^2x^2-2*5x+1=(5x-1)^2