Help with inductive step

[fresh epoch]

Im stuck and idk what to do rn

[full sandal]

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[quiet timber]

do u know how induction works?

u check for n=4

then u assume it works for n (general)

and then u proof for n+1 using the assumption that for n works

[fresh epoch]

right

thats what Im trying to do

but im stuck at the last line