Q111 / 160 · AP EAMCET 2022 (04 Jul Shift 2) · Mathematics

If ∫exxx+xdx=exAx+Bx+C+K, then A+B+C=

  • A
    -2
  • Correct answer
    B
    2
  • C
    4
  • D
    -4

Solution

I=∫exxx+xdx

Let x=t

12xdx=dt

i.e. I=2∫ett2+tdt

=2∫t2etdt+2∫tetdt

=2t2et-2∫2tetdt+2∫tetdt

=2t2et-2∫tetdt

=2t2et-2tet-∫etdt=2t2et-2tet+2et+C'

=ex2x-2x+2+C'

Hence, A+B+C=2

Hence, the correct answer is option: 'B'.

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