Multiply.(3x + 9y)(-5x + 8y + 1)
A. -15x2 + 24xy + 3x + 72y2
B. -15x2 - 21xy + 3x + 72y2 + 9y
C. -15x2 - 45xy + 3x + 72y2 + 9y
D. -15x2 - 21xy - 21y2
Answer: B
Mathematics
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