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FP1 proof by induction question- sequences Watch

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    Hi,

    I've been practising some proof by induction qs, particularly the ones with sequences. I understand how to do the ones where you are given Un+1 and have to prove Un. However there are some where you are given Un+2 in terms of Un+1 and Un and you have to prove Un. Please could someone explain how to approach these ones?

    Thanks
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    (Original post by VioletPhillippo)
    Hi,

    I've been practising some proof by induction qs, particularly the ones with sequences. I understand how to do the ones where you are given Un+1 and have to prove Un. However there are some where you are given Un+2 in terms of Un+1 and Un and you have to prove Un. Please could someone explain how to approach these ones?

    Thanks
    It may help if you watch this: https://youtu.be/yBbKFSLHlFw?t=706 (start at 11:48)
 
 
 
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