1. The problem statement, all variables and given/known data Problem #4 from here: http://www.math.washington.edu/~jtittelf/ExtraCredit.pdf 2. Relevant equations ? 3. The attempt at a solution There's only one example of using undetermined coefficients in my textbook. I'm not sure where to start. x = t2a + tb + c ?????? That's just a ball park guess, since then x' will have just have constant vectors and vectors multiplied by t, like in the problem.