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    its q7a
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    (Original post by Nels98)
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    Your method is correct and you should have the right answer but for the last part I would suggest you work with the algebra without making any substitution and you will see that you can factorise and follow from that.
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    (Original post by Mehrdad jafari)
    Your method is correct and you should have the right answer but for the last part I would suggest you work with the algebra without making any substitution and you will see that you can factorise and follow from that.
    ah good and thank you. I thought I had over complicated it.
 
 
 
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