The problem asks for the entries of A

^{n}where A is a 2x2 matrix. The answers are functions of n, and WeBWorK seems to be accepting some versions of the correct answer but not others.For instance, if the correct answer is 3·2

^{n}+ 3^{n}, the student should be able to enter 3*2^n+3^n and get it right. However, WeBWorK says this is wrong.However, WeBWorK does accept 3*(2)^n+(3)^n as a correct answer. The requirement that the base of the exponent be put in parentheses seems artificial.

Looking over the problem code, I didn't do anything unusual, other than change the tolerance mode to absolute. (This was causing errors when the answer was 0.) However, I noticed that when I was setting up the formulas with the correct answer, I have parentheses there. Is that what's causing the problem?