Question

Definite integral. See attachment.

Answer 1

Why does he not turn u back into -x^2?

Answer 2

And is there a reason he distributes the -1, but not the 1/2?

Answer 3

there is no need to resub in your u if youve already adjusted your limits to accomodate the u setup

Answer 4

its correct

Answer 5

x = 0 to x = t

u = -x^2

ua = -0^2 = 0
ub = -t^2 = -t^2

Answer 6

so, not only is there no need, but it would be incorrect to do so it seems.

Answer 7

since everything is in terms of u, there is no need to convert this back

Answer 8

if you did not want to change the limits .... then you would be pressed to resub it in

Answer 9

And distributing the negative is just stylistic?

Answer 10

yes

Answer 11

i guess, it looks nicer imo

Answer 12

some people frown on a negative first .... feng shway ?

Answer 13

I wll frown on u

Answer 14

lol

Answer 15

I'll keep that in mind for the test :)

Answer 16

yes, be sure to save extra time for the smiley faces

Answer 17

Haha, thanks guys.