Question

Adding and Subtracting polynomials: (3a +2b-7c)+ (6b-4a+9c) + (-7c-3a-2b) I think I need it right but could someone give me the answer so I can double check??

Answer 1

did*

Answer 2

what answer did you get?

Answer 3

its in my notebook at school. I'll have to check it in the morning!!

Answer 4

How are you going to check if it's all the way over there?

Anyways, if you add the 'a' terms, you get

3a + (-4a) + (-3a) = ???

Answer 5

I have school in the morning.. first hour is studyhall! I think I did get something like that with the 3a + (-4a) thank you!

Answer 6

what does 3a + (-4a) turn into when you add?

Answer 7

-1a right?

Answer 8

correct

Answer 9

then we add on (-3a)

so

-1a + (-3a) = -4a

Answer 10

therefore, we know this so far

3a + (-4a) + (-3a) = -4a

Answer 11

now onto the b terms

what is 2b+6b + (-2b) equal to?

Answer 12

6b ?

Answer 13

correct

Answer 14

and finally, the c terms

what do you get when you add up all the c terms?

Answer 15

-5c ?

Answer 16

good

Answer 17

all together, we know that

(3a +2b-7c)+ (6b-4a+9c) + (-7c-3a-2b)

simplifies to

-4a+6b-5c

Answer 18

okay, that makes sense. So our final answer is -4a+6b-5c

Answer 19

yes it is

Answer 20

Okay! thank you!

Answer 21

you're welcome