indices problem

[lament mist]

yo thanks for reading my message
how does this go to that is there something im missing

[sterile herald]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with: ```diff
   +close

[fair axle]

they rearrange so that 3^(k+1) and 2×3^(k+1) is together then factor out 3^(k+1)

[lament mist]

hmm maybe im not fully understanding

[near hedge]

just factorise $3^{k+1}$, so let $x = 3^{k+1}$ then the expression u sent is $x - 3 + 2x$ which is the same as $ 3x - 3 = 3(3^{k+1}) - 3$

[sharp tangle]

madlad-mathemagician

[lament mist]

OH

thanks so much

[near hedge]

np

[rocky venture]

+close