Scope of formula: Difference between revisions
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Created page with "===Description of Bottleneck=== When using a mathematical formula students don’t check whether the prerequisites for the applicability of this formula apply. This relates t..." |
m Riegler moved page DecodingWork:Scope of formula to Scope of formula: abandoning DecodingWork-namespce |
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==Description of Bottleneck== | |||
When using a mathematical formula students don’t check whether the prerequisites for the applicability of this formula apply. | When using a mathematical formula students don’t check whether the prerequisites for the applicability of this formula apply. | ||
This relates to the following intended learning outcome: Students always check whether a given formula comes with prerequisites for its applicability and whether these prerequisites hold in a given situation. | ==Intended Learning Outcome== | ||
This bottleneck relates to the following intended learning outcome: Students always check whether a given formula comes with prerequisites for its applicability and whether these prerequisites hold in a given situation. | |||
=== | ==Examples== | ||
#Square root and square are inverse to each other for nonnegative real numbers, i.e. for <math>a \ge 0</math>: <math>\sqrt{a^2}=a</math>. Without the prerequisite <math>a \ge 0</math> the formula would read <math>\sqrt{a^2}=|a|</math>. In fact, many students use <math>\sqrt{a^2}=a</math> without checking the applicability/validity of this prerequisite. Of course, the fomula then leads to wrong results if the ignored prerequisite does not hold. This is e.g. the case for <math>a=-2</math>. There <math>\sqrt{a^2}=\sqrt{(-2)^2}=\sqrt{4}=2</math> and, hence, does not equal <math>a=-2</math>. | |||
#Scope of quadratic formula as described in [[DecodingWork:Scope of quadratic formula]] | |||
[[Category:Mathematics]] | |||
[[Category:Bottleneck]] | |||
Latest revision as of 14:30, 22 July 2024
Description of Bottleneck[edit | edit source]
When using a mathematical formula students don’t check whether the prerequisites for the applicability of this formula apply.
Intended Learning Outcome[edit | edit source]
This bottleneck relates to the following intended learning outcome: Students always check whether a given formula comes with prerequisites for its applicability and whether these prerequisites hold in a given situation.
Examples[edit | edit source]
- Square root and square are inverse to each other for nonnegative real numbers, i.e. for <math>a \ge 0</math>: <math>\sqrt{a^2}=a</math>. Without the prerequisite <math>a \ge 0</math> the formula would read <math>\sqrt{a^2}=|a|</math>. In fact, many students use <math>\sqrt{a^2}=a</math> without checking the applicability/validity of this prerequisite. Of course, the fomula then leads to wrong results if the ignored prerequisite does not hold. This is e.g. the case for <math>a=-2</math>. There <math>\sqrt{a^2}=\sqrt{(-2)^2}=\sqrt{4}=2</math> and, hence, does not equal <math>a=-2</math>.
- Scope of quadratic formula as described in DecodingWork:Scope of quadratic formula