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x+2x+42exdx is equal to 

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a
exxx+4+C
b
exx+2x+4+C
c
exx−2x+4+C
d
2xexx+4+C

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detailed solution

Correct option is A

∫x+2x+42exdx=∫exx2+4x+4(x+4)2dx=∫exx(x+4)(x+4)2+4(x+4)2dx=∫exxx+4+4(x+4)2dx=∫exx(x+4)dx+∫4ex(x+4)2dx=exxx+4−∫4ex(x+4)2dx+∫4ex(x+4)2dx=xex(x+4)+C


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