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| [https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type]
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| ==Using variables in text==
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| It is simple to substitute the variables in the text, you only need to enclose the corresponding variables with <span style="font-family:monospace;font-size:113%;">{ }</span>. Each text field has a scope of variables. All variables x of either number or string in the scope of the text can be used to replace the corresponding placeholder <span style="font-family:monospace;font-size:113%;">{x}</span> in the text.
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| It is also possible to evaluate an expression directly in the text by adding an equal sign at the beginning of the bracket such as <span style="font-family:monospace;font-size:113%;">{=x/1000}</span>. It is easier to use if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below:
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| <pre style="font-size:113%;width: 98%;">
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| What is the speed of the rocket if it travels with distance {=x/1000} km in {t} s?
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| </pre>
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| ==Using variables in text equations==
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| Text equations are equations that are displayed in the text using an equation syntax such as:
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| *TeX
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| *MathML
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| *AsciiMath
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| Variables can be substituted in these equations, as in the text, by enclosing them with {}. Expressions such as {=x/1000} can also be substituted in these equations.
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| <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;">
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| <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div>
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| Write the following equation in the TeX syntax, where {a}, {b} and {c} will be substituted by the value of these variables:
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| ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0
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| <pre style="font-size:113%;width: 98%;>
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| \( {a} x^2 + {b} x + {c} = 0 \)
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| </pre>
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| </div>
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| <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;">
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| <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div>
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| Write the following equation in the MathML syntax, where {a}, {b} and {c} will be substituted by the value of these variables:
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| ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0
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| <pre style="font-size:113%;width: 98%;">
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| «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»{a}«/mn»«msup»«mi»x«/mi»«mn»2«/mn»«/msup»«mo»+«/mo»«mn»{b}«/mn»«mi»x«/mi»«mo»+«/mo»«mn»{c}«/mn»«mo»=«/mo»«mn»0«/mn»«/math»
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| </pre>
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| MathML equations are usually created with the aid of an editor. When creating the equation, it is easier to write a number, say 99, in lieu of the variables, for example:
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| <pre style="font-size:113%;width: 98%;margin-top:-5px;">
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| «math style=¨font-family:Arial¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨17px¨»«mn»99«/mn»«msup»«mi»x«/mi»«mn»2«/mn»«/msup»«mo»+«/mo»«mn»99«/mn»«mi»x«/mi»«mo»+«/mo»«mn»99«/mn»«mo»=«/mo»«mn»0«/mn»«/mstyle»«/math»
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| </pre>
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| and then replace the numbers 99 by the variables {a}, {b} and {c} in the HTML code.
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| </div>
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| <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;">
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| <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div>
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| Write the following equation in the AsciiMath syntax, where {a}, {b} and {c} will be substituted by the value of these variables:
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| ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0
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| <pre style="font-size:113%;width: 98%;">
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| `{a} x^2 + {b} x + {c} = 0`
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| <script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=AM_HTMLorMML"></script>
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| </pre>
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| </div>
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| [https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type]
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| [[Category:Formulas question type]]
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