If x2 + 8y2 - 12y - 4xy + 9 = 0, then the value of (7x - 8y) is: – McqOptions

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1.	If x2 + 8y2 - 12y - 4xy + 9 = 0, then the value of (7x - 8y) is:
A.	12
B.	9
C.	21
D.	5
Answer» C. 21

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