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Abby
Abby

United states

Need help on how to work it out

Date Posted: 4 years ago
Views: 373

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
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Here. Let me know if you do not understand the workings or the picture is too blurry.
Eric Nicholas K
Eric Nicholas K
4 years ago
You can use a computer to sketch the cubic graph out. You will see that from 0 to 8, there is a section in which the graph is below the horizontal axis.

Remember that areas below the horizontal axis will have a negative integral value (this is a property of areas which lie below the x-axis) and this negative value will cancel out the positive values above the x-axis and not add to the overall value.

This is the reason why we have to check for any possible such situations.