Find the sum of 7a^3+14a+12 and -6a^3+12a^2-7

- anonymous

Find the sum of 7a^3+14a+12 and -6a^3+12a^2-7

- chestercat

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- anonymous

How do I solve this? It's a bit different from my last question...

- madhu.mukherjee.946

just add the like terms together and then say what do you get?

- anonymous

I had a^3+26a+10 but I know that's not right.

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## More answers

- madhu.mukherjee.946

7a^3+14a+12 + -6a^3+12a^2-7
=a^3+12a^2+8a+5

- anonymous

Can you explain how you did that?

- madhu.mukherjee.946

yes

- madhu.mukherjee.946

7a^3-6a^3=a^3 {both are like terms}

- madhu.mukherjee.946

you have only one term 12a^2 and there is no other term with a^2 so,12a^2+0=12a^2

- anonymous

oh but the - in front of 6 is not for subtracting. it wants me to add -6 to 7

- madhu.mukherjee.946

14a-6a=8a{again both like terms}

- madhu.mukherjee.946

no it wants you to subtract because you have a -ve sign in front of 6

- madhu.mukherjee.946

you gotta check for like terms and see their symbols carefully and then you gotta add or subtract accordingly

- madhu.mukherjee.946

again 12-5 =7

- anonymous

"find the sum" so 6 is negative. but 7+ negativ 6 is the same as 7 minus 6 right?

- madhu.mukherjee.946

yeah

- madhu.mukherjee.946

anything more you want to know?

- anonymous

No I'm pretty sure I understand this tyope of question now. I may have another in a second so i'll check that first.

- madhu.mukherjee.946

okay

- madhu.mukherjee.946

may i have my medal please:P

- anonymous

sure how do i do that

- madhu.mukherjee.946

just click on the best response option

- anonymous

just to clarify
-4x^2
-7x^2
x^2
------
-10x^2 assuming i'm adding the polynomials?

- madhu.mukherjee.946

correct

- anonymous

ok thanks!!!

- madhu.mukherjee.946

welcome!:)are you new here

- anonymous

yes i am lol. i have one (hopefully last for now XD) question for you.

- madhu.mukherjee.946

welcome to openstudy!!

- madhu.mukherjee.946

say your question

- anonymous

-4x^2+3xy- y^2
-7x^2- xy +6y^2
x^2+4xy-2y^2
---------------
my answer
-10x^2+6xy-(-3y^2)

- anonymous

i think something is wrong with it...

- madhu.mukherjee.946

wait

- madhu.mukherjee.946

nope its partially correct:)

- madhu.mukherjee.946

-10x^2+6xy+3y^2

- anonymous

partially? ok what is the incorrect part?

- madhu.mukherjee.946

that -(-3y^2)

- anonymous

ok so it is +3y^2

- madhu.mukherjee.946

what is 6-1-2

- anonymous

my school program is telling m there should be one more symbol/digit in there somewhere...
6-1-2 is 3

- madhu.mukherjee.946

good

- anonymous

ok well i guess it'll tell me what it's looking for when i send in the answers. but the way you showed me does look right.

- madhu.mukherjee.946

nope this is correct but i don't know if you have posted correctly

- anonymous

i think i did. my program likes to mess with me haha

- anonymous

wait i know hat i did XD. I put 6x instead of 6xy. I got it now. Thank you!!!

- madhu.mukherjee.946

okay:)

- madhu.mukherjee.946

don't get panicked just keep yourself calm:)

- madhu.mukherjee.946

before you do maths just sit and breathe in and out deeply from your heart and try to feel your inner core,this will give you immense help and concentration:)

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