is there anyway to help not mix up adding and subtracting polynomials cuz when i try and do a subtraction problem i usually wind up adding. if there's any special way i could set it up or something so i won't forget that would be cool... laterrr
Well...you could start off and do it the way we did it at the beginning of the year, with the equation action bank, and DISTRIBUTE!!! So write your equation (3x-23) ; (-2x+24) and then check if your adding or subtracting and distribute a positive one or negative one to the respective quantity. So... 3x-23 -1(-2x+24) = 3x-23 -1(-2)x + -1(1)24 = 3x-23 +2x - 24 = 5x -45 Ta-Daa! ╟ §o §aid §ovalius╢
6 comments:
OOOO!!! ME ME ME, and Stephanie are having fun!
Fun?! And no questions?! Not possible!
is there anyway to help not mix up adding and subtracting polynomials cuz when i try and do a subtraction problem i usually wind up adding. if there's any special way i could set it up or something so i won't forget that would be cool... laterrr
Well...you could start off and do it the way we did it at the beginning of the year, with the equation action bank, and DISTRIBUTE!!! So write your equation (3x-23) ; (-2x+24) and then check if your adding or subtracting and distribute a positive one or negative one to the respective quantity. So...
3x-23 -1(-2x+24) =
3x-23 -1(-2)x + -1(1)24 =
3x-23 +2x - 24 =
5x -45
Ta-Daa!
╟ §o §aid §ovalius╢
Basically, rewrite the problem and be sure to say whether it is adding or subtracting and then say I WILL DISTRIBUTE!!!
╟ §o §aid §ovalius╢
Well said Sovalius. Remember, all subtraction statements can be re-written as addition by ADDING THE OPPOSITE.
I'll cite another example:
Bypass the confusion by ALWAYS ADDING!!
1) Identify the polynomial that is to be subtracted
2) Flip the sign of each term
3) NOW, you can ADD
For example:
Subtract the 2nd poly from the 1st.
3x^2-2x+6 ; -5x^2-3x+6
OFF WE GO!!
change the 2nd expression to:
5x^2+3x-6 "good job, flipper!"
THEN ADD!...
don't forget to re-group, re-order!
(3x^2+5x^2)+(-2x+3x)+[6+(-6)]
yielding:
8x^2+1x+0
fully simplified:
8x^2+x
WHAT FUN!!
Post a Comment