If \[(3x-4)\,(5x+7)=15{{x}^{2}}-ax-28,\] what is the value of a? – McqOptions

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1.	If \[(3x-4)\,(5x+7)=15{{x}^{2}}-ax-28,\] what is the value of a?
A.	\[1\]
B.	\[-1\]
C.	\[-2\]
D.	\[2\]
Answer» C. \[-2\]

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