What is the product? open paren 7 x squared close paren times open paren 2 x cubed plus 5 close paren times open paren x squared minus 4 x minus 9 close paren

First multiply (2x³ + 5)(x² − 4x − 9): distributing gives 2x⁵ − 8x⁴ − 18x³ + 5x² − 20x − 45. Then multiply each term by 7x², giving 14x⁷ − 56x⁶ − 126x⁵ + 35x⁴ − 140x³ − 315x². This matches choice C, not A; the correct answer is C.

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