alleryStart learning →For x² - 6xy + 5y² + 10x - 14y + 9 = 0, what is abc + 2fgh - af² - bg² - ch²?
A210
B9
C-81
D0
Answer & Solution
Correct answer: D. 0
With a=1, h=-3, b=5, g=5, f=-7, c=9: 45 + 210 - 49 - 125 - 81 = 0.
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