What is the missing term? (10⁢x−4⁢x^2)−(7⁢x+?)=3⁢x−6⁢x^2

First combine the known terms: (10x − 4x²) − (7x + ?) = 3x − 4x² − ?. To match the right side, 3x − 6x², the missing term must contribute −2x² after subtraction. Since it is being subtracted, the missing term itself is 2x², which is choice B.

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