Calculate to sum of the first 12\displaystyle {12} terms of the following series:

8−16+32−64\displaystyle {8}-{16}+{32}-{64}

Formula

   (ignore subscripts in this step but not in written work)

Stocktake

Type in the list of known variables, example x=1,y=2...:

 

Substitute

   (use subscripts if necessary in this step)

Solve


   (use subscripts if necessary in this step)

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