Self Checking Expression CL?

Questions
1

I want to find out how to write code that will take a student’s input of, let’s say x^2+2hx+h^2 and mark that answer as correct if my version was x^2+h^2+2xh. I have been trying to use string matching but it doesn’t really work for the students unless I tell them how to format, in which case I guide them towards an answer which I don’t like.

Looking at the CL options, it looks like I may want to use the differenceFunction because the differenceFunction between the student input and the one I write should be 0, but how exactly do I structure/write the code?

(I’m trying to figure out this 2-variable example so that I can modify the CL for 1-variable responses too).

2

Hey Atilano!

Two questions:

  1. Are you asking for a formula here or will they be using numbers in there for h?
  2. Are you specifying that this expanded form be used or do you just want any equivalent expression?
3

I’m asking for a formula and I want students to enter their expanded form for a difference quotient. I figured the two variable h, (to give students a chance to work with literal equations and strengthen their algebra skills).

4

Someone shared this code and it works! In case you have any additional notes I should consider?

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image1814×755 70.3 KB

5

This should be your function for c. When evaluating C and U, you should use more than one solution to check a quadratic.