Friday

December 19, 2014

December 19, 2014

Posted by **Kara** on Wednesday, August 29, 2007 at 10:10am.

(x/3+3/4)(3x/4-3/5)

- Algebra -
**Kara**, Wednesday, August 29, 2007 at 11:10amknow I am supposed to use the FOIL method.But is this right? I am really not sure I did this right, something just seems off about it.

So i would Multiply

x/3 * 3x/4=x^2/4

x/3 *-3/5= -x/5

3/4 *3x/4=9x/4

3/4 * -3/5

I know to add both of my bottom numbers have to be the same so the common factors of them would be 20

so I get x^2-4x/20+45x/20-9/20=

x^2+41x/20-9/20

- Algebra -
**DrBob222**, Wednesday, August 29, 2007 at 11:31amknow I am supposed to use the FOIL method.But is this right? I am really not sure I did this right, something just seems off about it.

So i would Multiply

x/3 * 3x/4=x^2/4

x/3 *-3/5= -x/5

3/4 *3x/4=9x/4**wouldn't this be 9x/16?**

3/4 * -3/5

I know to add both of my bottom numbers have to be the same so the common factors of them would be 20

so I get x^2-4x/20+45x/20-9/20=

x^2+41x/20-9/20

- Algebra -
**Kara**, Wednesday, August 29, 2007 at 11:36amOhh, I knew something looked off...so it should be x^2-5x/80-9/20

- Algebra -
- Algebra -
**DrBob222**, Wednesday, August 29, 2007 at 12:24pmWhat happened to the 4 (x^2/4) from the first term? You started with that but I think your dropped it.

For the middle term, it is -x/5 + 9x/16 and that part becomes (-16x + 45x)/80 which is 29x/80.

The last term is 9/20.

Then you can get rid of the 4, 80, and 20 as denominators by multiplying through by 80.

**Check my thinking. Check my arithmetic.**

**Answer this Question**

**Related Questions**

algebra - Solve. x/9-1/7=26/63 STEP 1: The LCM is _________ To clear ...

someone help - my post is still on this page as algebra, could someone elaborate...

algebra - im not to good at algebra so here goes im supposed to multiply 5.(3.2...

Pre-Algebra - inequality 0.75x>3 Multiply both sides of the inequality by 4/3...

Algebra Sq Rt - to multiply the sq rt of 3 cubed by the sq rt of 9 cubed I first...

Algebra - 16. I am supposed to multiply the matrices B and C by each other B is...

algebra - When I multiply 6v^9*10v^7 I get 60v^16 My question is, do I add the 9...

algebra II - Select the best possible first step to solving the system by first ...

Algebra - How do I solve for elimination method on this problem: 0.3x - 0.2y=4 ...

need guidance on an algebra problem - 20 x+3(y-1)=11 2(x-y)+8y = 28 multiply ...