What is the sum of the polynomials? open paren 8 x squared minus 9 y squared minus 4 x close paren plus open paren x squared minus 3 y squared minus 7 x close paren
Answer
A
9 x squared minus 12 y squared plus 3 x
B
9 x squared minus 6 y squared plus 3 x
C
9 x squared minus 12 y squared minus 11 x
D
7 x squared minus 6 y squared plus 3 x
Explanation
Combine like terms: 8x² + x² = 9x², −9y² − 3y² = −12y², and −4x − 7x = −11x. The sum is 9x² − 12y² − 11x, which is choice B.
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