Respuesta :

i believe the answer is 3d+6
The answer you are looking for is:
Step 1: (d-1)(d+2)=d^2+d-2
Step 2: (d-3)(d^2+d-2) = d^3+d^2-2d-3d^2-3d+6 = d^3-2d^2-5d+6

Your answer is 
 d^3-2d^2-5d+6
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