Mathematics, 15.04.2020 02:47 Erin1535

NEED HELP NOW PLEASEEE, what algebraic expression must be added to the sum of 3x^2+4x+8 and 2x^2-6x+to give 9x^2-2x-5

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NEED HELP NOW PLEASEEE, what algebraic expression must be added to the sum of 3x^2+4x+8 and 2x^2-6x+...