math
posted by lisa .
what is the sum of (x^23x+2) and (5x^23x8)?
how would you solve this???? please help

math 
JJ
You have to combine like terms.
When you add you keep the variable(letter) with its exponent and and the coefficients (numbers in front)
3x + 5x = 8x
You are going to combine your x^2 terms
your x terms and your constants.
Show me your answer and I will check it. 
math 
lisa
so would it be
7x^26?? 
math 
JJ
3x 3x = 6x
this is the same as 3x + 3x + 6x
You are right, but missing the middle term.
3x + 3x = 0 that isn't what you had here. 
math 
lisa
oh because i thought it was a negative and a positive so they cancel out
but its 7x^26x6? or...? 
math 
JJ
Correct. You have to be careful with the signs.

math 
lisa
Thank you c:

math 
JJ
You are welcome.
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