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Descompuneti in factori:
7x la 5 + 7x la 4 - 14x la 3


Răspuns :

7x⁵ + 7x⁴ - 14x³=
=7x³(x²+x-2)=
=7x³(x²-x+2x-2)=
=7x³[x(x-1)+2(x-1)]=
=7x³(x-1)(x+2)
[tex]7x^5+7x^4-14x^3=\\ 7x^3(x^2+x-2)=\\ 7x^3(x^2+2x-x-2)=\\ 7x^3[x(x+2)-(x+2)]=7x^3(x+2)(x-1)[/tex]