SOLUTION: Make a the subject of the formule in the equation s=n\2[2a+(n-1)d]

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Question 1180654: Make a the subject of the formule in the equation s=n\2[2a+(n-1)d]
Found 2 solutions by mananth, ikleyn:
Answer by mananth(16946)   (Show Source): You can put this solution on YOUR website!
s=n\2[2a+(n-1)d]
2s/n = 2a+(n-1)d
(2s/n)/(n-1)d =2a








Answer by ikleyn(52776)   (Show Source): You can put this solution on YOUR website!
.
Make a the subject of the formula in the equation s = (n/2)*(2a+(n-1)d).
~~~~~~~~~~~~~~~~~


            Please pay attention how I edited your writing to make the formula correct. 


You start from

    s = .



Multiply both sides by  .  You get then

     = 2a + (n-1)d.



Next move the term (n-1)*d from the right side to the left side CHANGING ITS SIGN.  You will get then

     = 2a.



Last step multiply both sides by  .   You finally get

  
     +---------------------------------------+
     |   a = .          |
     +---------------------------------------+


It is your answer.


You can transform this final formula further as you wish (using equivalent transformations, ONLY).

Solved and carefully explained.


///////////////


Ignore the post by @mananth, since it is TOTALLY WRONG.



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