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x (50 - 2x^2) (x +5) - 2 (x + 5) + 6 (50 - 2x^2)
Empezamos a multiplicar y nos queda esto:
50x^2 + 250x -2x^4 -10x^3 -2x +10 +300 -12x^2
Lo ordenamos:
-2x^4 -10x^3 +38x^2 + 248x +310
(Si querias que despejase la "x", tendrías que haberlo igualado a 0)