Submitted by Meryjoy99 on Thu, 05/18/2017 - 15:14
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Could I get some help for the last part, please?
How can I derive the last result? I've tried to use again initial stem but it led me nowhere...
Submitted by Meryjoy99 on Thu, 05/18/2017 - 15:14
Could I get some help for the last part, please?
How can I derive the last result? I've tried to use again initial stem but it led me nowhere...
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Try completing the square of
Try completing the square of $r^2-r+1$ and $r^2+r+1$ and compare the two