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

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. 
lisa
so would it be
7x^26?? 
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. 
lisa
oh because i thought it was a negative and a positive so they cancel out
but its 7x^26x6? or...? 
JJ
Correct. You have to be careful with the signs.

lisa
Thank you c:

JJ
You are welcome.
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