What are the questions referring to when they say use equation (2)? equation (2) was never mentioned.
can you post a link to the question?
Here is a link to problem set 2. Questions 2A-1 and 2A-3 refer to "(2)", but (2) is not given. Thanks. http://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/unit-2-applications-of-differentiation/part-a-approximation-and-curve-sketching/problem-set-3/MIT18_01SC_pset2prb.pdf
I believe they are referring to the readings labeled NOTES: http://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/readings/course-reader/ (from the 18.01 course). For the questions you posted 2A Approximation you want the notes, section A (4th down)... i.e. http://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/readings/a_approximations.pdf
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