# Having a quadratic math input direct students to a certain screen

**URL:** https://cl.desmos.com/t/having-a-quadratic-math-input-direct-students-to-a-certain-screen/1928
**Category:** Questions
**Created:** [November 12, 2020, 4:10pm UTC](https://cl.desmos.com/t/having-a-quadratic-math-input-direct-students-to-a-certain-screen/1928 "2020-11-12T16:10:59Z")
**Posts on this page:** 1
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### Author: ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)
#### Post date: [November 12, 2020, 4:15pm UTC](https://cl.desmos.com/t/having-a-quadratic-math-input-direct-students-to-a-certain-screen/1928/2 "2020-11-12T16:15:31Z")

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You might check out some of this thread:

> [@Check Algebraic Expression Answer](https://cl.desmos.com/t/check-algebraic-expression-answer/787/19):
>
> Thanks. I’m not actually part of the Desmos team, just a user who enjoys the coding puzzles and helping people out. First, you can use countNumberUsage to identify specific expressions. (See post 6 in this thread). Second, if you have equivalent expressions, you could just create a function that is the difference of the two. Being equivalent, any value of x should evaluate to zero. Say you want a student to simplify exp1 in a math input. exp1=`4x-2x+5` f= simpleFunction("${exp1} - (${this.la…

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