Where did jacob make a mistake, and what was the error? a. jacob made a mistake at step 4. the actual evaluation of the rewritten equation is approximately -1.636. b. jacob made a mistake at step 2. the actual evaluation of the rewritten equation at x = 2 is 3. c. jacob made a mistake at step 5. he should have used x = as the new upper bound. d. jacob did not make any mistakes in the calculation process.