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Radicals and Absolute Values - Problem 4

Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Since the square root of x is technically defined as the absolute value of x, we should be writing absolute value signs when we're doing other square roots of variables as well. Sometimes texts say, "assume all variables represent positive values," which means you don't need to worry about this at all. Otherwise, odd powers of variables coming from even roots will need absolute values.

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