SOLUTION: {{{(3a-12b+c)-(6a+20b-3c)}}} i can not understand what i am doin wrong in this prob.. i took the paren. away..{{{3a-12b+c-6a+20b-3c}}} then i multiplied everything in the secon

Question 14393:
i can not understand what i am doin wrong in this prob..
i took the paren. away..
then i multiplied everything in the secon par. by 1 and changed the signs...

then i combined like terms...
i got the answer

now i know that it was wrong cause my teacher told me that it was...but can you please help me to beter under stand this?
thanks

Answer by elima(1433) (Show Source): You can put this solution on YOUR website!

Why did you subtract the -12b and the -20b?
You need to remember they are both negative numbers, so you will actually add them and keep the negative sign.
=)
RELATED QUESTIONS
Hi I need help in solving this equation: Divide: (20b^3+12b^2+20b+34)/(4b+4)... (answered by persian52)

3a/4b - 2a/5b i got 3a*5b/4b*5b - 2a*4b/4b*5b= 15ab/20b - 8ab/20b = 7ab/20b is... (answered by Theo)

{{{12b^4+36b^3-20b^2}}} i really dont get how to factor the polynomial can you help[... (answered by TutorDelphia)

If 3a + 4b=b which of the following must equal 6a + 6b? (a). 0 (b). 12 (c)... (answered by nerdybill)

Hello! Thank you for this great service. I have not studied algebra for more than 30... (answered by richwmiller,jrfrun)

I am having trouble with multiplying rational expressions The problem is... 6a over 2b... (answered by jim_thompson5910)

each polynomial must be fully factored and that you can only cancel factors; you cannot... (answered by josgarithmetic)

16a^20b^8c^-6a^-12b^-4 over 80a^5b^20c^18 (answered by mathmontrealmath)

Solve the following for c. 12b = -3c +... (answered by richwmiller)