Anybody good at algebra?

[Boomstick777]

Does anybody know how you would make 'k' the subject of the equation? See the pic attached. Any help would be appreciated..

http://i51.tinypic.com/2mnj3uf.jpg

 

[The Howling Wolves]

I know how but it would be better if you did your own homework.
Remember what you do to one side of the = sign you do to the other side.
hint....multiply both sides by k then divide each side by "a"
k=????????/

 

[Copyright]

k=sqr(b)/a

 

[BugMeister]

multiply both sides by root b then turn the whole thing upside down..:sarc:

 

[The Howling Wolves]

k=sqr(b)/a

You get an "A" but go to the back of the room...Let boomstick figure it out!

 

[Boomstick777]

I know how but it would be better if you did your own homework.
Remember what you do to one side of the = sign you do to the other side.
hint....multiply both sides by k then divide each side by "a"
k=????????/

Thanks for your reply. k = b^2/a? I just don't get the method of this I need an example so can do the rest...

Does the sqr'b' stay the same even though it swapped sides? I thought it would become b^2?

 

[sportscout]

Does making k the subject of the equation mean the same as solving for k? Is this the new math?

 

[The Howling Wolves]

Find out what you each is asking for then do whatever it takes to get it alone on one side.
Then do the same to the other side..
In the first one you multiplied both sides by k
then divided by "a" to both sides to get k=b^2/a

Do that to the rest of them....

 

[Boomstick777]

Find out what you each is asking for then do whatever it takes to get it alone on one side.
Then do the same to the other side..
In the first one you multiplied both sides by k
then divided by "a" to both sides to get k=b^2/a

Do that to the rest of them....

Does the (Square root of b) stay as sqr(b) or change to b^2 (b,squared)? Im confused becasuce thought there would be more work to do, it looks like the 'k' has just been swapped out for the 'a'..

 

[BugMeister]

the answer to Q.a is the easiest, since it just involves shifting the three expressions around
Q.b is slightly more complex since it involves balancing the equation by doing some arithmetic

- remember that what you do to one side of the equation, you must also do to the other..
so - for example, taking 2 from the right side means that you also have to do the same to the left..

you are not being asked to simplify the equations - just to rearrange them..

 

[SledgeDG]

Howling Wolf is right...Basic rule with equations is whatever you do...always do it to both sides

@sportscout: apparently that's what they call it now. when I was at school, it was solve for k...For some reason "they" think they have to change terminology every decade (or so).

@Bugmeiser: Close.. but you might want to rethink that procedur
Edit, since you postet again: I refer to this

multiply both sides by root b then turn the whole thing upside down

-DG

 

[Boomstick777]

Im still lost lol, if someone could break down the steps it would be awesome. Once I have the method figured out im sure these will seem easy, its all new to me I have no idea how to do a or b.. I know about balancing the sides, 'the basics' I don't understand how in question 'a' how the Square root of b stays as the square root of b if it changes sides etc..

 

[BugMeister]

Howling Wolf is right...Basic rule with equations is whatever you do...always do it to both sides

@sportscout: apparently that's what they call it now. when I was at school, it was solve for k...For some reason "they" think they have to change terminology every decade (or so).

@Bugmeiser: Close.. but you might want to rethink that procedur
Edit, since you postet again: I refer to this

multiply both sides by root b then turn the whole thing upside down

-DG

I was standing on me head at the time..!! :roflmao:

 

[SledgeDG]

With an operation involving roots you always have 2 options:
Option 1 : solve the root (extremely unpracticable)
Option 2: use the whole thing as 1 expression (which means it doesn't change when its been "moved" to the other side
I hope that's a bit clearer

-DG

 

[BugMeister]

Im still lost lol, if someone could break down the steps it would be awesome. Once I have the method figured out im sure these will seem easy, its all new to me I have no idea how to do a or b.. I know about balancing the sides, 'the basics' I don't understand how in question 'a' how the Square root of b stays as the square root of b if it changes sides etc..

think of root b as an expression..

- it's a bit like the Time = Distance/Speed formula..

all you're doing is moving the expressions around to suit their use:

Distance = Speed.Time
Speed = Distance/Time

 

[The Howling Wolves]

Im still lost lol, if someone could break down the steps it would be awesome. Once I have the method figured out im sure these will seem easy, its all new to me I have no idea how to do a or b.. I know about balancing the sides, 'the basics' I don't understand how in question 'a' how the Square root of b stays as the square root of b if it changes sides etc..

We broke down the first one now you have to do the rest...
If I fish for you ............you won't learn how to fish ...you will starve!

 

[Boomstick777]

Ok I think I got question 'a' figured out..

a= Sqr(b)/k
becomes
a x k = Sqr(b) xk
a x k = Sqr(b)
a x k/a = Sqr(b)/a
so
k = Sqr(b)/a

Question 'b' is harder how do I just get the 'b' from the sqr(b)? Hmm

 

[BugMeister]

I'd just leave it as root b

 

[The Howling Wolves]

a-2= root of b over k
k(a-2) = root of b

 

[SledgeDG]

Remember: sqr(b)*sqr(b) = b