- #1
LiHJ
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Homework Statement
Dear Mentors and PF helpers,
I saw this question on a book but couldn't understand one part of it.
Here the question:
Solve the following inequality
I copied the solution as below
Homework Equations
The Attempt at a Solution
I don't understand why the numerator in step (1) can become 1 in step (2).
Can someone explain the concept behind.
Thank you for your time