x^8+7x^4+16=x⁸+8x⁴+16-x⁴

=(x⁴+4)²-x⁴

=(x⁴-x²+4)(x⁴+x²+4)

I'm sorry mk k bt

mk k bt dung hay sai nx

Thai do cua De Men vs cj Coc la xem thuong ,coi khinh , bay tro treu cj Coc va hon vs cj Coc trong bai dong giao "...Vat long cai Coc cho tao..."