Q47 / 75 · JEE Main 2020 (07 Jan Shift 2) · Mathematics

If the function f defined on -13,1/3 by fx=1xloge1+3x1-2x,when x≠0k,when x=0, is continuous, then k is equal to.

Correct answer: 5

Solution

limx→0⁡fx=limx→0⁡ln⁡1+3xx-ln⁡1-2xx
=limx→0⁡3ln⁡1+3x3x+2ln1-2x-2x=3+2=5

limfx→0ln1+fxfx=1

∴fx, will be continuous if f0=limx→0⁡fx

Thus, k=5

Hence, the correct answer is 5.

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