10am-14na-15bm+21bn-5mc+7cn how...?

Question

hero · Answer

5m(2a-3b-c)-7n(-c-3b+2a)=(2a-3b-c)(5m-7n)

hero · Answer

If that doesn't make sense, I can explain

anonymous · Answer

i have mutiple choice anwsers and thats not one of them?

hero · Answer

What are they?

anonymous · Answer

1) (5m-7n)(2a-3b-c)

hero · Answer

What the....That is it

anonymous · Answer

2) (7m-5n)(2a-3b-c)

hero · Answer

Wait

hero · Answer

That's exactly what I have for number one

anonymous · Answer

3)(7m-5n)(3a-2b-2c)

hero · Answer

It's just in a different order. Don't you see?

anonymous · Answer

it doesnt matter what oder its in?

hero · Answer

If you look after the equal sign...in the problem I posted, the answer is the same as number 1

NO, it doesn't it's two numbers being multiplied by each other

9 x 8  is the same as 8 x 9 because they both equal 72, right? 

So (2a-3b-c)(5m-7n) is the same as (5m-7n)(2a-3b-c)

hero · Answer

The parentheses indicate multiplication

hero · Answer

The rule for multiplication is a x b = b x a 

associative property, remember?

anonymous · Answer

hum i see what you are saying and that makes sense. its been a while sense i have done algebra

hero · Answer

The answer is definitely the first option

anonymous · Answer

alrite well thank you for your help