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Expanding the Integration problem.

**How does this work like when you expand the integration how did it result in _-1/4(b+a)^2_?**
![Question on expanding the integration](https://math.codidact.com/uploads/8q4wgywkqqr88eciw7nylsvk5byv)

If someone could help explain this part to me that would be greatly appreciated, thanks a bunch.