Basic algebra

**foofergutierrez** · August 2nd 2006, 01:37 PM

I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.

2. The quotient when 3 more than a number is divided by 3 less than that same number.

3. 6x^2y^3+9x^2y^3
3x^2y^2

I am very confused and I have to be at work in a few hours so I need HELP ASAP!

**ThePerfectHacker** · August 2nd 2006, 01:40 PM

Originally Posted by foofergutierrez

I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.

$(3x+7)+(4x-9)+(5x-6)=12x-8$

**CaptainBlack** · August 2nd 2006, 01:47 PM

Originally Posted by foofergutierrez

2. The quotient when 3 more than a number is divided by 3 less than that same number.

Let $x$ be the number, then we are told that:

$\frac{x+3}{x-3}$

RonL

**foofergutierrez** · August 2nd 2006, 01:47 PM

I thought I was doing it wrong but it was right! Thanks for your help!

**Quick** · August 2nd 2006, 01:49 PM

Originally Posted by foofergutierrez

I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.

the perimeter is all the sides added together so:

$side_1+side_2+side_3$

substitute: $3x+7+4x-9+5x-6$

group like terms: $3x+4x+5x+7-9-6$

add/subtract: $12x-8$

2. The quotient when 3 more than a number is divided by 3 less than that same number.

3 more than a number, ( $n+3$ ) is divided by 3 less than a number, ( $n-3$ )

write it out: $\frac{n+3}{n-3}$

and that number can't be simplified

3. $\frac{6y^3x^2+9y^3x^2}{3y^2x^2}$

add: $\frac{(6+9)y^3x^2}{3y^2x^2}$

add: $\frac{15y^3x^2}{3y^2x^2}$

seperate the fractions: $\frac{15}{3}\times\frac{y^3}{y^2}\times\frac{x^2}{ x^2}$

write it out: $\frac{3\times5}{3}\times\frac{yyy}{yy}\times\frac{ xx}{xx}$

divide: $\frac{\not3\times5}{\not3}\times\frac{\not y\!\!\!\not yy}{\not y\!\!\!\not y}\times\frac{\not x\!\!\!\not x}{\not x\!\!\!\not x}$

write it out: $5\times y=5y$

voila

[edit] I can't believe you guys, answering the questions quicker than me! (except for Cap'n's answer for #3, he's a bit late[/edit]

**CaptainBlack** · August 2nd 2006, 01:50 PM

Originally Posted by foofergutierrez

:
3. 6x^2y^3+9x^2y^3
3x^2y^2

Add the terms in the denominator to get:

$\frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=\frac{15x^2y^3}{3x^2y^2 }$ ,

then cancel so:

$\frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=5y$ .

RonL

**foofergutierrez** · August 2nd 2006, 01:56 PM

Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!

**CaptainBlack** · August 2nd 2006, 01:58 PM

Originally Posted by foofergutierrez

Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!

Oh-Noooo... zombies

RonL

**topsquark** · August 2nd 2006, 02:00 PM

Originally Posted by CaptainBlack

Oh-Noooo... zombies

RonL

Oh good Lord! (Shakes his head in despair, wishing he had thought of it first.)

-Dan

**Quick** · August 2nd 2006, 03:45 PM

You know what I'm wondering? What kind of teacher has something due at midnight...

**topsquark** · August 2nd 2006, 05:17 PM

Originally Posted by Quick

You know what I'm wondering? What kind of teacher has something due at midnight...

You know, I made that mistake once and showed up for a Ceramics lab 12 hours late...

-Dan

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