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    Equalities : Summations

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    In the answer given by an OTA to a previous question I had asked, there are three steps I do not understand.

    Step 1

    Why is it that

    Step 2

    Why do we have

    Step 3

    Finally, why is the previous line equal to

    I would be very grateful if you could explain these three steps to me.

    © BrainMass Inc. brainmass.com March 4, 2021, 5:44 pm ad1c9bdddf
    https://brainmass.com/math/graphs-and-functions/equalities-summations-presented-8712

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    Step 1

    Why is it that

    Step 2

    Why do we have

    Step 3

    Finally, why is the previous line equal to

    I try to give ...

    Solution Summary

    Some equalities are clarified. The solution is detailed and well presented.

    $2.49

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