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junior college 1 | H2 Maths
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farhan sadik
Farhan Sadik

junior college 1 chevron_right H2 Maths chevron_right Singapore

Why is the answer c for this qn?

Date Posted: 4 years ago
Views: 439
J
J
4 years ago
Work backwards.


From the question we know that :

3 < x < 5

The idea is to get both sides to be the negatives of each other first.

3 - 4 < x - 4 < 5 - 4
-1 < x - 4 < 1


Then we can rewrite as :

|x - 4| < 1

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Ethan Lie
Ethan Lie's answer
20 answers (Tutor Details)
1st
This website explains the concept of inequalities with absolute brackets well. take a look https://www.mathplanet.com/education/algebra-1/linear-inequalitites/solving-absolute-value-equations-and-inequalities