What is the missing polynomial? ? minus open paren 20 minus 4 x minus 5 x squared close paren is equal to 20 minus 7 x squared

Add the polynomial in parentheses to both sides to isolate the missing polynomial: P = (20 − 7x²) + (20 − 4x − 5x²). Combine like terms to get 40 − 4x − 12x², so the missing polynomial is choice C.

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