1. ## multipling poly

4x^2 -2x +6

x x +3
--------------------
12x^2 -6x 18
4x^3 -2x^2 +6x =
4x^3 8x^2 +0x +18
If -6 +6 =0 Why doesn't x -x =0

2. Originally Posted by Leona_Marie
4x^2 -2x +6

x x +3
--------------------
12x^2 -6x 18
4x^3 -2x^2 +6x =
4x^3 8x^2 +0x +18
If -6 +6 =0 Why doesn't x -x =0
I really can't make sense of your post. What are you trying to do?

3. Originally Posted by Leona_Marie
4x^2 -2x +6

x x +3
--------------------
12x^2 -6x 18
4x^3 -2x^2 +6x =
4x^3 8x^2 +0x +18
If -6 +6 =0 Why doesn't x -x =0
Ahhh I see.

$\displaystyle (x+3)(4x^2-2x+6) = x(4x^2-2x+6)+3(4x^2-2x+6)$

$\displaystyle = 4x^3-2x^2+6x+12x^2-6x+18$

$\displaystyle = 4x^3+10x^2+18$

$\displaystyle x - x$ DOES equal zero :S.

4. Originally Posted by Mush
Ahhh I see.

$\displaystyle (x+3)(4x^2-2x+6) = x(4x^2-2x+6)+3(4x^2-2x+6)$

$\displaystyle = 4x^3-2x^2+6x+12x^2-6x+18$

$\displaystyle = 4x^3+10x^2+18$

$\displaystyle x - x$ DOES equal zero :S.
sorry thats not how I typed it. Im still learing my polys so when I do a problem then look at the answer sometimes they confuse me with bad answers... thats why I ask. thankyou