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Harder induction

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hanaacdr:
Hi could i please get some help on this question:

If Un = 2^(n+2) + 3^(2n+1)
show that Un+1= 2Un + 7.3^(2n+1)
and hence show that Un is divisible by 7 for n>= 1

thank you

RuiAce:

--- Quote from: hanaacdr on January 08, 2017, 12:02:48 pm ---Hi could i please get some help on this question:

If Un = 2^(n+2) + 3^(2n+1)
show that Un+1= 2Un + 7.3^(2n+1)
and hence show that Un is divisible by 7 for n>= 1

thank you

--- End quote ---
Remember that the dot means to multiply.

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