Hi,

          2x^2 + (-7x) +   4     R = 7

        __________________________

x + 2 | 2x^3 – 3x^2 – 10x + 15

      - (2x^3 +  4x^2)

       ---------------

                -7x^2 -  10x

             - (-7x^2 -  14x))

                --------------

                          4x + 15

                      - ( 4x + 8)

                          --------

                                 7

 

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