Expression randomly reordering

[Heber Nelski]

Hey All,

I have noticed some interesting behavior on one of my questions. I have an expression of the form:

ax^2 + bx + c

Where a, b, and c are randomly generated. When the question appears in a quiz, it has about 10% chance or so as being rewritten as 

bx + ax^2 + c

I can't seem to figure out why this random reordering of terms is occurring.

The question is located at:

https://numbas.mathcentre.ac.uk/question/share/view/43044efc-53be-442e-97bc-93fdb7e82211

Thoughts?

Heber

[Ben Brawn]

Change it to  $\simplify[canonicalorder]{{a}x^2+{b}x+{c}}$ and it will always have the higher powers first like you want. In your version, it changes the order when the quadratic term's coefficient is negative. 

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