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# How does this expand to make that

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Laws of indices.
4. Thanks so do i have to memorise that? Or is it given as a formula for further maths? I'm in year 11 going to year 12 and never seen that
Thanks so do i have to memorise that? Or is it given as a formula for further maths? I'm in year 11 going to year 12 and never seen that
It's basic knowledge, there is no formula. You're expected to know the laws of indices in GCSE, are you not? You will revisit indices at the start of Y12 in Core 1 anyway, but do remember that you can use this trick as it will come in useful throughout AS and A2.

6. ohhh shame i do know that, my bad just havent done maths for a bit.. thanks anyway
7. One more thing: can you not * the (k-1) by 2?
8. why is it just left, but the 2^k and 1 are * by 2
why is it just left, but the 2^k and 1 are * by 2
. This is exactly the same as , you're saying why isn't b multiplied as well but it is. I think you need to go over the basics of algebra again to clarify some things, because it will be impossible to progress always.
10. Oh i get it, ye i should.. i feel stupid
11. Thanks a lot btw
Oh i get it, ye i should.. i feel stupid
13. (Original post by Zacken)
That's only valid when b and c are positive integers.
14. (Original post by HapaxOromenon3)
That's only valid when b and c are positive integers.
Obviously.

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