[ww-bugs] Bug 3419: New: rounding error in answer

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3419

           Summary: rounding error in answer
           Product: Problem libraries
           Version: unspecified
          Platform: Macintosh
        OS/Version: Mac OS
            Status: NEW
          Severity: major
          Priority: P5
         Component: Library (OPL)
        AssignedTo: jj at asu.edu
        ReportedBy: abalogh at utpa.edu
        Web browser ---
           version:


Christopher Sira wrote this problem but I can't find his email.

WHFreeman/Rogawski_Calculus_Early_Transcendentals_Second_Edition/7_Techniques_of_Integration/7.1_Integration_by_Parts/7.1.5.pg

The problem is to integrate 
x^a ln(x)

The answer is 
(1/(a+1))x^(a+1) ln(x) - (1/(a+1)^2)x^(a+1)+C

with a=random(2, 15, 1);


for large values of a (a>10) (1/(a+1)^2) is rounded in the answer checker and
the correct answer is marked incorrect.

I don't know how it is introduced.

-- 
Configure bugmail: http://bugs.webwork.maa.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching all bug changes.