y=x^4 + 7 x^2 -144 , y=- x^4 + 4 x^3 - 19 x^2 + 64 x-48 , y=(5x+7)(x^3 -3x^2+16x-48)y=x^4 + 7 x^2 -144 , y=- x^4 + 4 x^3 - 19 x^2 + 64 x-48 , y=(5x+7)(x^3 -3x^2+16x-48)

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