A) \[1\]
B) \[-1\]
C) \[-2\]
D) \[2\]
Correct Answer: B
Solution :
\[(3x-4)\,(5x+7)=15{{x}^{2}}-ax-28\] \[\Rightarrow \] \[15{{x}^{2}}+x-28=15{{x}^{2}}-ax-28\] Comparing the coefficients of like terms, we get \[a=-1\].
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