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(×-2)(×+2)(ײ+4)-(ײ+1)²+2(ײ+1)²

Răspuns :

(x-2)(x+2)(x²+4)-(x²+1)²+2(x²+1)²=
(x²-4)(x²+4)-(x^4+2x²+1)+2(x^4+2x²+1)=
x^4-16-x^4+2x²+1+2x^4+4x²+2=
2x^4+6x²-13