Question

@Mertsj Can you tell me what I'm doing wrong? :/
http://www.sketchtoy.com/36616368

Answer 1

What are you trying to do?

Answer 2

http://www.sketchtoy.com/36740597

Answer 3

http://www.sketchtoy.com/36740789

Answer 4

http://www.sketchtoy.com/36741562

Answer 5

I'm confused.

Answer 6

sorry unheard :/

Answer 7

I've been trying to do this problem for two days and everyone who tried to explain it made no sense. :/ But here's the original problem: Find the difference of (−5x2 − x3 − 3) − (9x3 + 3x − 6x2). Be sure to show all of your work in a neat and organized fashion.

Answer 8

Try to keep the variables together

Answer 9

Skull showed you what I've been trying to do

Answer 10

$$(−5x^2 − x^3 − 3) − (9x^3 + 3x − 6x^2).$$

Answer 11

The first thing is add the opposite of each term in $$(9x^3 + 3x − 6x^2)$$

Answer 12

Can you tell me where I messed up and see if I can go from there?

Answer 13

you add the -3's

Answer 14

Yes, you need to keep the "similar" terms together. That means write in the variable "x"

Answer 15

http://www.sketchtoy.com/36741562

Answer 16

To add (or subtract) polynomials you add (or subtract) their similar terms.

Similar terms are monomials that are exactly alike or that differ only in their numerical coefficients.

Answer 17

$$(-3x) + (-3) \neq -6$$

Answer 18

http://www.sketchtoy.com/36743594 ?

Answer 19

Correct :)

Answer 20

It is important to carry along the variable, because of the distributive property of multiplication.

Answer 21

you are doing it correctly, except you have to keep the variables

Answer 22

think of it as having so many "x cubed" and so many "x squared" and so on...
and you are keeping track of how many of each type you have.

Answer 23

http://www.sketchtoy.com/36744878

Answer 24

Okay, is that it? or is there another step for me to do?

Answer 25

That is it.

Answer 26

\[ -10^3 + 1x^2 -3x + (-3) \]
is correct. but people often don't bother to write 1 for the coefficient (it is understood to be 1 without putting it in). and + -3 is most often written as -3
in a multiple choice it would probably be written as
\[ -10^3 + x^2 -3x -3 \]

Answer 27

The important thing to remember is to carry along the variable, and this is because of the distributive property of multiplication. @unheard

Answer 28

Thanks guys! :)

Answer 29

Thank you for trying to learn :D