Do can you tell when you can use the substitution method? I just tried it on , but I don't get the right answer unless I square the and then proceed normally.

What about substitution on ?

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- Apr 9th 2006, 10:22 PMcindersubstitution method question
Do can you tell when you can use the substitution method? I just tried it on , but I don't get the right answer unless I square the and then proceed normally.

What about substitution on ? - Apr 10th 2006, 01:05 AMearbothQuote:

Originally Posted by**cinder**

to 1.:

use u(x) = 2x+3. Then du/dx = 2. That means du = 2*dx.

So you could use the substitution method if there are the factor 2:

Now you can re-substitute and you'll get:

to 2.:

Factorize (x^2-1) = (x+1)(x-1). Then you can cancel (x-1) and you'll get:

.

From here on you know what to do!

Greetings

EB - Apr 10th 2006, 06:10 AMcinderQuote:

Originally Posted by**earboth**

which becomes

then

and solve normally, just using ? - Apr 10th 2006, 06:52 AMThePerfectHackerQuote:

Originally Posted by**cinder**

- Apr 10th 2006, 07:27 AMcinderQuote:

Originally Posted by**ThePerfectHacker**

- Apr 10th 2006, 07:30 AMThePerfectHackerQuote:

Originally Posted by**cinder**

- Apr 10th 2006, 07:33 AMcinderQuote:

Originally Posted by**ThePerfectHacker**