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(X-5)(x+5)(x+25) mă ajutați. ... plz

Răspuns :

[tex](x-5)(x+5) = x^2-5^2=x^2-25\\\implies (x-5)(x+5)(x+25)=(x^2-25)(x+25)=\\=x^3+25x^2-25x-625[/tex]
folosim formula (a-b)(a+b)=[tex] x^{2} - x[tex]= (x^{2} -25)(x+25)= x^{3} +25 x^{2} -25x-625[/tex]^{2} [/tex]