Answer
Solving radical equations involves squaring both sides, from time to time.
By squaring, the information on signs ($+,-) $ may be lost, which leads to a "solution" that either
- causes a square root of a negative number, or
- causes an equation:$\ \ $ (square root)=(negative number).
Neither is acceptable, so these "solutions" are discarded, and are called extraneous.
Work Step by Step
Given above.
