Solve the equation 
by extracting square roots.
Definitions:
Intelligence Quotient
A measure of a person's cognitive abilities and intellectual potential compared to a statistical norm, typically assessed by standardized tests.
William Stern
A psychologist best known for developing the concept of the intelligence quotient or IQ.
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.
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