Mathematics, 31.03.2021 01:50, dnarioproctor

PLEASE HELP I NEED TO FIND WHAT THE QUESTION MARK IS (10x^2+10x^3-9x^4)-(4x^3+?-8x^2)=-1 9x^4+6x^3+18x^2

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PLEASE HELP I NEED TO FIND WHAT THE QUESTION MARK IS (10x^2+10x^3-9x^4)-(4x^3+?-8x^2)=-1 9x^4+6x^3...