(x + 3) (x - 3) (x^2 + 9) - (x^2 + √5) (x^2 - √5)
=x^4 - 81 - (x^2 + √5) (x^2 - √5)
=x^4 - 81 - x^4 + 5
=x^4 - x^4 - 81 + 5
= -81 + 5
= -76
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(x + 3) (x - 3) (x^2 + 9) - (x^2 + √5) (x^2 - √5)
=x^4 - 81 - (x^2 + √5) (x^2 - √5)
=x^4 - 81 - x^4 + 5
=x^4 - x^4 - 81 + 5
= -81 + 5
= -76
Un saludo mano, y hasta logo pos