Multiply.(x + y - 9)(x + y + 9)
A. x2 + y2 + 2xy + 81
B. x2 + y2 - 81
C. x2 + y2 + 2xy - 81
D. x2 + y2 + 2(xy - 9)
Answer: C
Mathematics
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Mathematics
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Mathematics
Refer to the following figure. Which points have negative y-coordinates?
?
?
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Mathematics