The following definite integral can be evaluated to give the answer A - B where A and B are found from substituting the limits of integration.
What are A and B?
Having a difficult time showing how to integrate this to get the answer
3ln(7x^2 + 5x + 3). The denominator can be represented by u and du would be 14x + 5. With this, I divide and multiply it all by 14 I believe to get the 3 thats in the answer. This will give me the integral of 3/u. According to integration rules, 1/u is equal to the ln of u. Thus i get 3ln(u) and sub back in the original values. Then you evaluate at 3 and 0 to get A and B. Is this correct? If it doesnt make sense then let me know I can try to clarify. Thankss!
I think this is what they are getting at... we have
And decide to let
Thenso our integral becomes...
Notice that I have left the limits of integration out. They are no longer 0 and 3. One way to prevent errors would just be to always explicitly write
But that's tedious.
So we will see that, when x = 0, u = 3 (from our choice of u sub above).
Likewise, when x = 3, u = ...
THOSE are the "A" and "B" to which they refer.
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