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C4 Integration

Please can someone help me?
In the Edexcel C4 Book, Exercise 6F Q3a I can't seem to understand why we have to substitute u^2 = x+4 instead of u=x+4
Any help would be great thanks
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Avatar for Sandro331
Sandro331
can you post the whole question please
Reply 2
Avatar for Cloudmc
Cloudmc
1
You can substitute either u^2 = x+4 or u= x+4.
I did this exercise last night using u= x+4 and it worked.
However for some questions such as Q3 c, the substitution they offer is generally the best and easiest option to integrate.
Reply 3
Avatar for Miffy98
Miffy98
OP
1
Original post by Cloudmc
You can substitute either u^2 = x+4 or u= x+4.
I did this exercise last night using u= x+4 and it worked.
However for some questions such as Q3 c, the substitution they offer is generally the best and easiest option to integrate.


Oh I see, thank you. I must've made a mistake because I used u=x+4 but didn't get the right answer.
Original post by Miffy98
Oh I see, thank you. I must've made a mistake because I used u=x+4 but didn't get the right answer.


If you are still stuck, please post your working :h:

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