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Dados los polinomios:
=> P(x) = x^2 - 2x + 4
=> Q(x) = x^2 + 2x + 4
=>R(x) = x^4 + 4x^2
Operación:
=> [P(x)][Q(x)] - [R(x)] = [x^2 - 2x + 4][x^2 + 2x + 4] - [x^4 + 4x^2]
...................................= [x^4 + 2x^3 + 4x^2 - 2x^3 - 4x^2 - 8x + 4x^2 + 8x + 16] - [x^4 + 4x^2]
..................................= [x^4 - 4x^2 + 16] - [x^4 + 4x^2]
..................................= x^4 - 4x^2 + 16 - x^4 - 4x^2
..................................= -8x^2 + 16 =>RESPUESTA
Espero haberte colaborado. Éxito en tus estudios