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# The Modulus Function - Maths A-Level

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1. Hi,

I was wondering if someone could help me on the following question? I really don't understand it!

The function f is defined for all real values of x by f(x) = |2x – 1| + 4.
The function g is defined by g(x) = |2x – 1| + 4 for x < 0. Find an expression for g -1 (x).

Thanks in advance!
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

Just quoting in Danny Dorito so she can move the thread if needed
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(Original post by Danny Dorito)
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3. (Original post by cmorton98)
Hi,

I was wondering if someone could help me on the following question? I really don't understand it!

The function f is defined for all real values of x by f(x) = |2x – 1| + 4.
The function g is defined by g(x) = |2x – 1| + 4 for x < 0. Find an expression for g -1 (x).

Thanks in advance!
Is f used for a later part of the question?

What do you understand when you are asked to find where g is a function, in general what would you do?

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