Find the derivative at the given x-value with the appropriate rule. 
Definitions:
Mental Age
A measure of an individual's mental attainment based on the age in which it takes an average individual to reach that same level of attainment.
Alfred Binet
A French psychologist best known for developing the first standardized intelligence test, which laid the foundation for modern intelligence testing.
Lewis Terman
An American psychologist best known for his revision of the Stanford-Binet Intelligence Scales and research on gifted children.
Tacit Knowledge
Knowledge that is difficult to transfer to another person by writing it down or verbalizing it.
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Q214: Find the derivative of the function.