Definite Integral [help] !!!


by mckallin
Tags: definite, integral
mckallin
mckallin is offline
#1
Jan23-08, 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)
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Rainbow Child
Rainbow Child is offline
#2
Jan23-08, 03:23 AM
P: 365
Try the substitution

[tex]\sqrt{7x+9}=y[/tex]
mckallin
mckallin is offline
#3
Jan23-08, 11:19 AM
P: 15
sorry, I still can't figure out it, can you give me some more detail? thanks a lot .

HallsofIvy
HallsofIvy is offline
#4
Jan23-08, 11:23 AM
Math
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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 x2.)
mckallin
mckallin is offline
#5
Jan23-08, 11:59 AM
P: 15
I got it, thanks for help!! ^-^


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