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how does one integrate ∫x(x+2)e^x dx answer ends up x^2e^x + c thanks in advance :)

In a pyramid in Egypt, the triangular sides are formed by rows of stone blocks. Each row has one less block than the row beneath it. If the bottom row of one side has 300 blocks in it, how many blocks were needed to form the side? If every corner block is shared by two sides, how many blocks...