Induction Question (1 Viewer)

[throwaway444]

Prove 7^n > 2^n + 5^n , for n>=2

Any help appreciated, sorry for no latex

 

[photastic]

 

[dan964]

Though would the last line be =RHS?
I would personally write

i.e. LHS > RHS

 

[InteGrand]

Though would the last line be =RHS?
I would personally write

i.e. LHS > RHS

Yes, last line should have read = RHS.

 

[throwaway444]

Thanks guys! - really appreciate it.

 

[photastic]

I had no idea it was = RHS. :O

 

[dan964]

^
don't worry
your answer was good.

 

[InteGrand]

The notation is that the sign used is meant to be referring to comparing with the line above.

E.g.

10 > 5
= 4+1 (since 4+1 is equal to what's in the line above (5)).

(You did this in the other lines of your proof.)

 

[photastic]

The notation is that the sign used is meant to be referring to comparing with the line above.

E.g.

10 > 5
= 4+1 (since 4+1 is equal to what's in the line above (5)).

(You did this in the other lines of your proof.)

Does it really matter? I could've placed LHS > RHS lol.

 

[InteGrand]

Does it really matter? I could've placed LHS > RHS lol.

It probably wouldn't matter in the HSC.

 

[dan964]

agreed