There is an issue with a Chegg textbook solution for Stewart\'s Calculus 7th Edi

Question

There is an issue with a Chegg textbook solution for Stewart's Calculus 7th Edition, Chapter 12.3, Problem 22. The "Provide feedback" buttons were not working for me, so I figured I'd alert the community to this problem that should be fixed.

More specifically, Steps 2 and 3 incorrectly find theta1, the angle between vectors AB and BC. This is because the solution fails to take into account the direction that the vectors are pointing. To find theta1 correctly, we should be using vectors BA (which is negative AB) and BC, not AB and BC, since we need both vectors to point outward from the starting point B. The correct theta1 is the supplement of the theta1 found in these steps, which is to be expected since -a dot b = -(a dot b), and cos(x) = -cos(180-x). The theta2 found in steps 5 and 6 happens to be correct since AC and BC are both the negatives of CA and CB respectively, resulting in a double negative that does not affect the final answer. The final answers should be theta1 = 54, theta2 = 28, and theta3 = 98.

To whoever sees this and takes action to fix the incorrect textbook solution, thank you in advance.

Explanation / Answer

Yeah you are correct. This is blunder mistake in that book. I have tried to provide the feedback but that was not working in me. Thats why i was not able to submit the feedback. I think we should send mail to experts so that mistakes can be removed from book.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.