
#1
Jan2308, 02:56 AM

P: 15

hello, can anyone help me how to complete the following definite integral? Thanks!!
∫ (x^2)*sqrt(7 x + 9) dx (From 0 to 1) 



#2
Jan2308, 03:23 AM

P: 365

Try the substitution
[tex]\sqrt{7x+9}=y[/tex] 



#3
Jan2308, 11:19 AM

P: 15

sorry, I still can't figure out it, can you give me some more detail? thanks a lot .




#4
Jan2308, 11:23 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,882

Definite Integral [help] !!!
If [itex]y= \sqrt{7x+ 9}[/itex], what is dx (in terms of dy and y)? What is x in terms of y? (So you can substitute for that x^{2}.)




#5
Jan2308, 11:59 AM

P: 15

I got it, thanks for help!! ^^



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