What is the sum of the polynomials? open paren 6 x plus 7 plus x squared close paren plus open paren 2 x squared minus 3 close paren

Combine like terms: x² + 2x² = 3x², the x-term is 6x, and 7 − 3 = 4. The sum is 3x² + 6x + 4, which is choice B.

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