In this tutorial I show you what the modulus function |x| is and how it is used in drawing the graphs of y= |f(x)| and y=f|(x)|. Its use in solving equations like | x + 2 | = 3. To see this and others in this series go to http://www.examsolutions.co.uk/maths-tutorials/Core-maths/functions/modulus-functions/revision-guide.php
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