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2E: Laws of logarithms, (3) (c) (i) watch

1. This really isn't working for me.
2. (Original post by IFoundWonderland)
I haven't done this in about a year and am re self teaching for a resit from a *****y textbook. Idek what that means
Are you sorted out yet?

I did it without using quadratics. Perhaps it was a bit of a long way but we arrived at the same answer.
3. (Original post by maggiehodgson)
Are you sorted out yet?

I did it without using quadratics. Perhaps it was a bit of a long way but we arrived at the same answer.
No I really don't get it. *see picture above*
I hope it's just a small mistake in my workings or something, but I can't see where I'm not following the rules properly.
4. (Original post by IFoundWonderland)

This really isn't working for me.
Well done! You underestimate yourself.

Your error is that when you multiply through by 2, the 1 needs doubling as well!

After that, forget y-substitution, the other method works just fine.

I've spotted a few other trivial errors on your working sheet. Such as when you use the log(4) x - log(4) x^2 = log(4) x/x^2 rule, the base only appears once! Also, you needn't substitute at all, as 2log(a) x - log(a) x is, of course, 1 log(a) x
5. (Original post by the bear)
that is a very unhelpful comment.
PRSOM
6. (Original post by CoolCavy)
how evil of them
tbf i don't know anything about maths so i'll leave lol just came cos wonderland is here
jamestg
Student403
TeeEm
SeanFM
I haven't started logs yet!! I'll leave it to the experts
7. (Original post by IFoundWonderland)

This really isn't working for me.
Am having trouble seeing enough of the picture at the right size for me to be able to see properly so I can't check your workings, sorry.

Try starting it off like this, for a change:

log2(x) + 1 = log4(x)
log2(x) + log2(2) = log4(x)
log2(2x) = log4(x) (y = y)
log2(2x) = y rearrange to find 2x
log4(x) = y rearrange to find x

See if you can solve from there.
8. (Original post by maggiehodgson)
Am having trouble seeing enough of the picture at the right size for me to be able to see properly so I can't check your workings, sorry.

Try starting it off like this, for a change:

log2(x) + 1 = log4(x)
log2(x) + log2(2) = log4(x)
log2(2x) = log4(x) (y = y)
log2(2x) = y rearrange to find 2x
log4(x) = y rearrange to find x

See if you can solve from there.
too l8 m8
9. (Original post by enaayrah)
PRSOM
i vote audrey hepburn
10. (Original post by jamestg)
I haven't started logs yet!! I'll leave it to the experts
lol. check m8
11. (Original post by Bath_Student)
lol. check m8
Okay...
12. (Original post by Bath_Student)
lol. check m8
I find it slightly funny in an ironic that you're mocking other peoples mathematical ability.
13. (Original post by Bath_Student)
i vote audrey hepburn
14. (Original post by Bath_Student)
too l8 m8
wadr I think you are in a different conversation to the OP and me.
15. Tbh I don't even think I'd come across this while doing AS Maths last year
Maybe it wasn't on the edexcel spec
16. (Original post by Zacken)
I find it slightly funny in an ironic [lacuna; sic] that you're mocking other people's mathematical ability.
Why? I wrecked da question m8.

Notice how I'm trying to integrate myself into the language of Cambridge plebs. Mandems innit..
17. (Original post by Bath_Student)
Why? I wrecked da question m8.

Notice how I'm trying to integrate myself into the language of Cambridge plebs. Mandems innit..
Sure thing, mate. Think whatever you want.
18. (Original post by enaayrah)
Tbh I don't even think I'd come across this while doing AS Maths last year
Maybe it wasn't on the edexcel spec
That disappointing moment when you realise that you're more gifted than a substantial part of TSR's Cambridge prospects.

You listening to me, Cambridge Admissions folk?
19. (Original post by Bath_Student)
That disappointing moment when you realise that you're more gifted than a substantial part of TSR's Cambridge prospects.

You listening to me, Cambridge Admissions folk?
Aren't you a bitter one.
20. (Original post by Bath_Student)
That disappointing moment when you realise that you're more gifted than a substantial part of TSR's Cambridge prospects.

You listening to me, Cambridge Admissions folk?
Lol okay believe what you want

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