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C4 Integration by substitution question

Use the substitution u = 2x ? 5 to show that 
the integral between the limits 3 and 2.5 of (4x ? 8)(2x ? 5)^7 dx
is 17/72 ?
What are the ? meant to be? Then I will try and help :smile:
Reply 2
Avatar for Thrug
Thrug
3
http://www.thestudentroom.co.uk/wiki/LaTex
Reply 3
Avatar for vc94
vc94
12
the integral between the limits 3 and 2.5 of (4x - 8)(2x - 5)^7 dx
...I believe.

Putting u=2x-5 gives dx=du/2.
Find an expression for 4x-8 in terms of u.
Change the limits e.g. x=3 becomes u=2x3-5=1.

Make the substitution and integrate w.r.t u
(edited 13 years ago)
Reply 4
Avatar for sohinder
sohinder
OP
Original post by vc94
the integral between the limits 3 and 2.5 of (4x - 8)(2x - 5)^7 dx
...I believe.

Putting u=2x-5 gives dx=du/2.
Find an expression for 4x-8 in terms of u.
Change the limits e.g. x=3 becomes u=2x3-5=1.

Make the substitution and integrate w.r.t u


TY
Reply 5
Avatar for steve2005
steve2005
17
Original post by sohinder
TY


What does TV stand for?
Original post by steve2005
What does TV stand for?


TY, not TV, stands for Thank You :smile:
Reply 7
Avatar for vc94
vc94
12
Original post by sohinder
TY


YW!
Reply 8
Avatar for vc94
vc94
12
Original post by vc94
YW!


Well thanks for the negative rep, guys!
I don't know why I bother sometimes!

YW=You're Welcome

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