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# C1 Simple maths: can you guys just check a few of these? watch

1. (Original post by RMorley)
It is but he has written it in an odd manner

he means
Oh, right yeah. I read it as . Apologies.
2. (Original post by RMorley)
25/3 is correct.

If you think about it if =5

then squaring both sides means

=25

Can you work out the

Spoiler:
Show
Ok so

=25

but for

Could've of sworn it was 3, not 1/3 - oh man this is hard to get my head around...
3. (Original post by Dededex)
Ok so

=25

but for

Could've of sworn it was 3, not 1/3 - oh man this is hard to get my head around...
Don't worry you are nearly there.

=9

therefore =1/9

(anything to the power of -1 is one over that i.e. 2^-1 is a half)

If you root both sides

=1/3
4. (Original post by RMorley)
25/3 is correct.

If you think about it if =5

then squaring both sides means

=25

Can you work out the

Spoiler:
Show
Because wouldn't you be square rooting both sides since it's to power half - so it'd be 3? not one third?
5. First one is 25/3.
a^-0.5 = 1/a^0.5
a^0.5 = square root of a
got it?
6. (Original post by rofflewaffle)
That isn't correct. How did you get that?
it is correct just wrote it in a different form(like rmorley mentioned)
7. (Original post by RMorley)
Don't worry you are nearly there.

=9

therefore =1/9

(anything to the power of -1 is one over that i.e. 2^-1 is a half)

If you root both sides

=1/3
Oh FFS I understand now, so sorry mate - should've known that -_- such a noob.

So when you get third and 25, how come you divide them in the end?
8. (Original post by Dededex)
Because wouldn't you be square rooting both sides since it's to power half - so it'd be 3? not one third?
Yes but you are forgetting the minus power

you have =3 which is correct

but you need to work out

which is where the 1/3 comes from
9. (Original post by Dededex)
Oh FFS I understand now, so sorry mate - should've known that -_- such a noob.

So when you get third and 25, how come you divide them in the end?
(5)^2/root9=25/3 you get it now?
10. (Original post by Dededex)
Oh FFS I understand now, so sorry mate - should've known that -_- such a noob.

So when you get third and 25, how come you divide them in the end?
You times them as

=

Therefore

=

So substituting your values it is 25 times by 1/3 i.e. 25/3
11. (Original post by Remarqable M)
it is correct just wrote it in a different form(like rmorley mentioned)
I know, I read it wrong (see above). Sorry .
12. (Original post by RMorley)
You times them as

=

Therefore

=

So substituting your values it is 25 times by 1/3 i.e. 25/3
Aah yeah I see, thanks for all your help now - have to admit, I thought I was cool on indices but that MoFo was tight :P
13. (Original post by RMorley)
You times them as

=

Therefore

=

So substituting your values it is 25 times by 1/3 i.e. 25/3

wait isn't better to separete them first ? like a^2p/a^1/2q >> then (a^p)^2/(a^q)^0.5
14. (Original post by Dededex)
Aah yeah I see, thanks for all your help now - have to admit, I thought I was cool on indices but that MoFo was tight :P
Quite alright, they take a while to get used to and you just have to practice to be confident with them
15. (Original post by rofflewaffle)
I know, I read it wrong (see above). Sorry .
ok
16. (Original post by RMorley)
You times them as

=

Therefore

=

So substituting your values it is 25 times by 1/3 i.e. 25/3
One more thing though - surely when you multiply two powers together you add them? Not 25 times 1/3 but 25 + 1/3? Hmm that bit is just a little weird.
17. (Original post by Dededex)
One more thing though - surely when you multiply two powers together you add them? Not 25 times 1/3 but 25 + 1/3? Hmm that bit is just a little weird.
You do, but here they were adding, but you spilt them up so they were multiplying. Think of it this way if you know x=3 and you need to work out x^2

you can express X^2 and x^1 multiplied by x^1 so it is 3x3=9 rather then 3+3

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