Posted by **soliman** on Tuesday, September 15, 2009 at 3:02pm.

Simplify and evaluate using distributive property of multiplcation

3x-4(2x-5)

I've tried many ways and can't come up with the same answer as the teacher. help please?

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**Ms. Sue**, Tuesday, September 15, 2009 at 3:18pm
What answer does your teacher have?

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**soliman**, Tuesday, September 15, 2009 at 3:20pm
3x8x+20

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**bobpursley**, Tuesday, September 15, 2009 at 3:26pm
No. 3x-8x+20=-5x+20 or 5(4-x)

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**soliman**, Tuesday, September 15, 2009 at 3:30pm
ok..i guess that is where i'm confused

3x-4(2x-5)

3x-(4X2x-4X5)

3x-(8x-20) (this was my answer)

I still not sure how the teacher and you came up with +20 instead of -20?

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**Ms. Sue**, Tuesday, September 15, 2009 at 3:36pm
Two minuses make a plus.

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**DrBob222**, Tuesday, September 15, 2009 at 3:48pm
3x-(4X2x-4X5)

**The - outside the parentheses changes the sign of everything inside the parentheses. Therefore, the 4*3x becomes -(8x) or -8x and the -4*5 becomes -(-20) or + 20.**

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**tyqwanza**, Tuesday, September 15, 2009 at 4:38pm
use the number line.is 458 closer to 450 or to 460

- to tyqwanza -
**DrBob222**, Tuesday, September 15, 2009 at 4:44pm
If you have a separate question to post, go to the top of the page and click on post a new question. Piggy backing onto another question rarely results in an answer for the piggy backer.

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**Anonymous**, Tuesday, September 15, 2009 at 4:54pm
Than you all. Dr. Bob222 that was exactly what I was missing, I could not see where the 2 minuses where together since our teacher explained it differently. This was very clear.

Thank you.

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