Basic Algebra

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machunry

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Joined
Oct 23, 2009
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6
Hi everyone,

First time poster.

I just had a math test and got these wrong and am looking for the correct way to do them.

Thank you.


1) -2cs^-2(-3cs)^2=


2) 3(4R+3)^2 =


3) 9(ab)^4 - 3(ab^2)^2 divided by 3ab^4 =


4) 2x = 3 - 4(7 + 3x) divided by 4 =


Thank you so much.

great site,
 
machunry said:
Hi everyone,

First time poster.

I just had a math test and got these wrong and am looking for the correct way to do them.

Thank you.


1) -2cs^-2(-3cs)^2=


2) 3(4R+3)^2 =


3) 9(ab)^4 - 3(ab^2)^2 divided by 3ab^4 =


4) 2x = 3 - 4(7 + 3x) divided by 4 =


Thank you so much.

great site,
Click to expand...

Since you said "I got these wrong," I assume you have something to show us as to what you did.

When we can see what work you did on each problem, we can help you correct your errors.
 
machunry said:
4) 2x = 3 - 4(7 + 3x) divided by 4 =
Click to expand...

I'm not sure on this, but I'll give it a try.
Get rid of the parenthesis first.
So it will be
2x=3-28-12x

Solve like terms
2x=-25-12x

Add 12x to the other side.
2x+12x=-25

Add like terms once again.
14x=-25

Now you divide?
-25 divided by 14

Equals -1.785

Divided by 4=
-0.446

I dunno, I just guessed. I used my computer calculator for the division.
 
I did have the answers that i put on the test but erased them and tried to fix them with no luck.

hope you can help.
 
machunry said:
I did have the answers that i put on the test but erased them and tried to fix them with no luck.

hope you can help.
Click to expand...

Well, here's a thought!

Try to work each problem again.

Then show us what work you DID...and we'll try to help you.

I'm sorry...."I erased them" doesn't make me feel real confident that you actually TRIED to do the work.
 
hello - these are the answers I had.

1) 5p-(q-2p)-[3q+(p-q)] = I got 8p-5q

2) -2cs^-2(-3cs)^2 =
-2cs^-2(-3cs) (-3cs)
-2 x -3 x-3 = -18
c + c + c = c^3
s^-2 + s + s = s

= -18c^3s

3) 3(4r + 3)^2
3(4r + 3)(4r + 3)
3 x 4 x 4 x 3 = 144
r + r = r^2

= 144 + r^2


4) 9(ab)^4 - 3(ab^2)^2 divided by 3ab^4
9(ab)^4 divided by 3(ab)^4 - 3(ab^2)3(ab^2) divided by 3(ab)^4


= 3 - 3ab^2


5) 2x= 3-4(7+3x) divided by 4
2x= -1(10x) divided by 4
2x= -10x divided by 4
2x + 10x = -10x + 10x
12x divided by 4

= 3x




please let me know if these are right and if not, please help me get the right ones.
thank you.
 
Ok...you have

1) 5p-(q-2p)-[3q+(p-q)] = I got 8p-5q

How did you get that?

5p - (q - 2p) - [3q + p - q]

5p - (q - 2p) - [2q + p]

5p -q + 2p - 2q - p

6p - 3q

That's what I get. Can you show me your work?
 
thank you for the help on that one, this is how i first worked it out.

5p-(q-2p)-[3q+(p-q)]
5p-(q-2p)-[3q+p+q)]
5p-(q-2p)-4q+p
5p-(1)(q-2p)-4q+p
5p-1q+2p-4q+p
= 8p - 5q

I hope you can help with the other questions I posted?

Thank you.
 
I think this is a great site but am wondering what you guys do to help - I am in a upgrading class to get into a construction course and its a indipentdent learn so I need help - sorry.
 
If I get a job delivering telegrams by bicycle, can't ride a bicycle, and ask you
to teach me HERE how, you wouldn't be able to, right?
That's a bit similar to us trying to teach THE BASICS in math: no classroom, blackboard, ....
 
Start your own thread: click on NEWTOPIC.

And one question per thread, please.
 
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