Integration by Substitution (Edexcel IAL P4 6.3)

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Pearson Edexcel IAL Pure Mathematics 4 Unit 6.3 Integration by Substitution
Unit 6 - Integration

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do you have to change the limits? after integrating and getting an expression in terms of u, can't we rewrite it in terms of x and apply the original limits? instead of getting limits in terms of u and substituting them into the integrated u expression?
edit: nvm u can

dianamarissaleighton
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is it okay to leave the integral with fraction powers? i tend to go wrong when simplifying

zohayrhyder
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hi! why has the power of u changed at 8:52? Thanks for the videos btw

RB-kgyg