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

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Solving Radical Equations - Problem 14

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

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Since the square root of a negative number gives no real solution, if you have an equation where an expression with x is under a square root (called the radicand,) you will have limitations on what values x could be. These are called domain restrictions. To find the domain restrictions, write an equation where you're showing how the radicand can not be negative (that is, the stuff under the square root has to be greater than or equal to zero.) Solve for x, and the resulting inequality tells you the possible inputs for x (called the domain.)

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