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    Ok so this question is taken from the Edexcel C3 Modular Maths Textbook- Exercise 2E Question 5.

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    Can someone look through my answer and tell me whether I'm right or what I can do to improve? I really struggled with this question and am not really sure if what I've done would get me the marks in a real exam. I mean, I don't really understand why x>a where a=-2 surely that would make the graph of m(x) only half of a parabola?

    here are my answers...
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    For a function to have an inverse, it must be a one to one function. So find the value of a such that the function is one to one for x>a.
 
 
 
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