Answer
When you square $\sqrt {x-1}$, the result is $x-1$.
Work Step by Step
However, when you square $\sqrt x - 1$, you'll still have a square root in the expression.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 10 - Radical Expressions and Equations - 10-4 Solving Radical Equations - Practice and Problem-Solving Exercises - Page 625: 51
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