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# C3 January 2013 integration question

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1. On this question, shouldn't you do integration by parts? on the mark scheme it's as if they've completely forgot about how it's multiplied by x, am i missing something really simple here?
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2. (Original post by lucyjane_x)
On this question, shouldn't you do integration by parts? on the mark scheme it's as if they've completely forgot about how it's multiplied by x, am i missing something really simple here?
No, they've done it by recognition. Use the substitution u = x^2 + 3 if you can't spot it.

The integral is of the form derivative of function * (function)^(a number) so integration to function^(number +1) / (number + 1)
3. (Original post by Zacken)
No, they've done it by recognition. Use the substitution u = x^2 + 3 if you can't spot it.

The integral is of the form derivative of function * (function)^(a number) so integration to function^(number +1) / (number + 1)
so you can't use parts?
4. (Original post by lucyjane_x)
so you can't use parts?
Not really, no. I suppose you could if you wanted to, but in a perverse, totally illogical and unrequisite way.

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