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efectuati (x-3)(x+3)(x^2+9)(x^4+81)

Răspuns :

(x+y)(x-y)=x²-y²

=(x²-9)(x²+9)(x⁴+81)=(x⁴-81)(x⁴+81)=x^8-81²=x^8-6561
(x-3)(x+3)(x^2+9)(x^4+81)
=(x^2-9)(x^2+9)(x^4+81)
=(x^2)^2-81)(x^4+81)
=(x^4-81)(x^4+81)
=(x^4)^2-81^2
=x^8-6561
Sper sa te ajute :)