Q.

If the function f defined as f(x)=1x-k-1e2x-1, x0 is continuous at x = 0, then the ordered pair (k, f(0)) is 

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a

3,2

b

3,1

c

13,2

d

2,1

answer is D.

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Detailed Solution

f(x)=1x-k-1e2x-1, f is continuous at x=0 limx0f(x) existslimx0f(x)=limx01x-k-1e2x-1 =limx0e2x-1-k-1xxe2x-1 =limx0e2x-1-k-1x2x2 since limx0e2x-12x=1 =limx02e2x-k-14x exists 2-k-1=0k=3f(0)=limx0f(x)=2e2x-122x=1k, f(0)=3,1

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