सदस्य: Melody

Nobody Special:
I know that I know how to do this problem, but for some reason it's not coming out right. Could someone show me how to do this?
I have the answer, I just forgot how to get to it.

lg2 (4 - 3x) = 5

Many thanks! ^_^

Hi Special It is really good to see you here again.
I think that you want
log ₂(4-3x) = 5 [ that is, log base 2 of (4-3x) = 5 ]

There is a couple of different ways to think about this

If log _ba = x
then a=b ^x
Remember: A log is a power. That is a really important thing to keep in your mind.
If you rearrange your equation like this it should become easy.

Method 2.
This uses log identities
If
y=log ₃x
then you can solve it like this (I am have trouble finding the right words so I will just show you0
3 ^y= 3 ^log₃x

the 3 and the log base 3 cancel each other out so you are left with
3 ^y= x

The two methods are really the same. Just different ways to think about it. You should be comfortable with both.
I haven't answered your question exactly but have I given you enough information?
If you get stuck please post again.

and again, it is really good that you are back.

Melody14 Des 2013

+118690

I think that last answer might be wrong. I need to think about it some more. Im on a train now so I probably won't be able to get back to you until tomorrow morning. Sorry about that.

Maybe you are right maybe it is a really hard question.

Melody13 Des 2013

+118690

goilk:
how to factor m squared minus 5.2 plus 1.0 ???

Maybe you meant

m ² - (5*2) +1

=m ² -10 +1

=m ² -9

=m ² -3 ²

= that is a difference of 2 squares. Can you do it now?

Melody13 Des 2013

+118690

did you mean

m ² -2m +1

It is a perfect square if that helps.

Melody13 Des 2013

+118690

Guest:
Is this correct?

500^2+600^2=C^2
250000+360000=C^2
/610000=c^2
/610000=about 781.02
C=about 781.02

P.S. /=square root n^2=number squared

First you should have stated that 500 units and 600 units are the 2 short sides of a right angled triangle and that you want to find the third side c.
other than that it is all correct except that you have introduced the square root too early
610000=c^2
sqrt(610000)=c units

I used a little c because it is conventional to use little letters for sides and capital letters for the vertices but it doesn't really matter.

These are only little mistakes so Smarty Party gave you good feedback.

Melody13 Des 2013

+118690

ChVN:
if [x + 1/x + 1][x + 1/x] = 1
then how much is[x^20 + 1/x^20 + 1][x^20 + 1/x^20]?

Deleted

Melody13 Des 2013

+118690

brittlilcute:
how do i locate the inverse log key?

Inverse log is not a standard way to say anything
I might know what you mean but I am not sure.
Could you give an an example of an actual problem please.

Melody13 Des 2013

+118690

iluvmathw/mr.hackett:
how do u go from 5y+5=45x+315 to -9x+5y=58??? PLEASE HELP

Hello iluv...
First yuo look for a common factor, a number or a letter that goes into all the terms.
5 goes into everything
Divide both sides by 5

Now the answer doesn't have any xs on the right hand side (RHS) so you will need to take them away from the RHS but you will need to take them away from the LHS as well so that your equation stays 'balanced'.

You should be able to do it now.

Melody13 Des 2013

+118690

29+16

Lily:
I added 2 + 1=3 and 9 + 6= 15 so den i added it together and got 56

Well 9+6=15
and 2+1=3
All correct so far.

but sorry, the answer is not 56
I'll show you quickly what you could have done
29=20+9
16=10+6
then
20+10=30
and
9+6=15
put them together and you get
30+15 = 30+10+5 = 45
-----------------------------------------------------------------------------------

I want you to answer these questions for me, they are easier than the last one.
I want you to split 2 digit numbers into tens and ones
for example 26 = 2 tens + 6units = 20+6
I'll do the first one to show you what I want.

1) 37 = 30+7
2) 84 =
3) 51 =
4) 42 =
5) 79 =

Can you do these 4 questions for me please Lily.

Melody13 Des 2013

यूजर का नाम	Melody
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