if f(x)={ex+aforx<0x−3forx≥0 is differentiable at x=0
then 'a' is equal to?
A
−2
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B
−3
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C
−4
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D
none
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Solution
The correct option is C−4 Given f(x) is differentiable at x=0 ⇒f(x) is continuous at x=0 Now, f(0)=0−3=−3 LHL=limx→0−f(x) =limx→0−ex+a=1+a ⇒1+a=−3 ⇒a=−4