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Question: f(x) =\(f^{'}(1) = 4\) is continuous from right at the point x = 2, then k equals :...

f(x) =f(1)=4f^{'}(1) = 4 is continuous from right at the point x = 2, then k equals :

A

0

B

¼

C

–1/4

D

None

Answer

¼

Explanation

Solution

k = limx2+\lim _ { x \rightarrow 2 ^ { + } } (x2+e12x)1\left( x ^ { 2 } + e ^ { \frac { 1 } { 2 - x } } \right) ^ { - 1 }

k = limh0\lim _ { h \rightarrow 0 } [(2+h)2+e1h]1\left[ ( 2 + h ) ^ { 2 } + e ^ { \frac { - 1 } { h } } \right] ^ { - 1 }

= (4 + 0 + 0 + e\infty)–1

= ¼