For which of the following function is : \[\frac{f-f}{a-b}\] Constant for all number a and b where \[a\ne b\]?

For which of the following function is : \[\frac{f-f}{a-b}\] Constant

1.	For which of the following function is : \[\frac{f-f}{a-b}\] Constant for all number a and b where \[a\ne b\]?
A.	\[f(x)=4x+7\]
B.	\[f(x)=x+{{x}^{2}}\]
C.	\[f(x)=\cos x\]
D.	\[f(x)={{\log }_{e}}x\]
Answer» B. \[f(x)=x+{{x}^{2}}\]

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For which of the following function is : \[\frac{f-f}{a-b}\] Constant for all number a and b where \[a\ne b\]?
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For which of the following function is : \[\frac{f-f}{a-b}\] Constant for all number a and b where \[a\ne b\]?

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