Question

If f ( x ) = 2 ln ( e x ) , what is the area bounded by f(x) for the interval [0, 2] on the x-axis?

Options :

  1. 1 2

  2. 1

  3. 2

  4. 4

Show Answer

Answer :

2

Solution :

y = f ( x ) = 2 ln ( e x )

The area bounded by the curve y = f(x) and in the interval where x ∈ (0, 2) is given by :

A = 0 2 2 ln ( e x ) d x

A = 0 2 2 ln ( e x / 2 ) d x

A = 0 2 2 × x 2 d x

A = [ x 2 2 ] 0 2 = [ 2 0 ] = 2

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