Math Is Fun Forum

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

I need help with some questions URGENT please help :|

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Last edited by NomNomNom (2010-11-07 20:43:15)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

Hi NomNomNom;

A) i)

I presume this is what you mean?!

Clear out the fractions by multiplying by 12.

Cleaning up

Added 12 to both sides.

Subtracted 3x from both sides

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

Exactly

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

Could you do that for all of them if it's not too much trouble? I really need them.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

B) i)

To solve by elimination means to add or subtract the equations. To solve this by elimination we add the equations. That causes the y term to disappear.

Substitute x = 3 into the second equation and solve, you get y = 2.

The solution is x = 3 and y = 2.

C) i)

That can be factored by inspection easily.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

I cannot read A)ii.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

Multiply again by 12.

Clean up:

Add 42 to both sides:

Subtract 8x from both sides:

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

nvm my comp was playing tricks on me

If you could help me with all these this morning I would be happy to give you ££ on paypal for your services?

Last edited by NomNomNom (2010-11-07 19:51:32)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

For C) ii) Use the quadratic formula:

With a = 2 b= 3 and c = - 7

plugging in you get:

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

I don't understand that in the slightest, could you just show me what I need to write down for the answers? for C I put in the real numbers.

For A) ii: you wrote a "-" instead of a "+" does that matter?

Last edited by NomNomNom (2010-11-07 19:59:10)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

For C ii I have shown you how to get the roots and have provided them.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

Just write it the way I put it down, r1 and r2 represent the roots. I did not do C ii first please check post #5

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

Ok thanks, wheres B) ii? :S

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

B)ii

By substitution. Solve for y in the second equation.

plug the y back into the first equation and clean up.

Solve for x

Plug the x value into the second equation.

Solve ,

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

NomNomNom

Member

Registered: 2010-11-07

Posts: 17

Re: I need help with some questions URGENT please help :|

Your a life saver
Thanks very much for this, you have no idea how much I needed this.

Last edited by NomNomNom (2010-11-07 20:44:19)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: I need help with some questions URGENT please help :|

Hi;

That will not be necessary.
But the next time you are in here you will learn some math or I will die trying. Understand?

Divide by 2:

Complete the square by taking half of the b term in this case 5 / 2 and squaring it.

Take square root of both sides:

So roots are:

Please go here to understand the process:

http://www.mathsisfun.com/algebra/compl … quare.html

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.