Question

Find the difference.

(7x^2 + x + 9) - (3x^2 + 4x - 5)
Ok I think this is
4x^2 - 3x + 4??

Answer 1

Sooo close...you just missed the constant term :)

Answer 2

Ok is it
4x^2 - 3x + 14

Answer 3

yes

Answer 4

Cool! Thanks can I ask you a couple more questions?? :)

Answer 5

sure

Answer 6

Find the difference.

(5x^2 + 2x + 11) - (7 + 4x - 2x^2)
Ok I don't understand this one....... Because I don't know how you would subtract 5x^2-7

Answer 7

Subtracting polynomials is like subtracting real numbers,

when you subtract real numbers you add the opposite of the number.

$$\Huge a-b = a+(-b)$$

Answer 8

To subtract polynomials you add the opposite of each term and then simplify.

Answer 9

$$(5x^2 + 2x + 11) - (7 + 4x - 2x^2)=(5x^2 + 2x + 11) + (-7 - 4x + 2x^2) $$

Answer 10

Holly crap your good at math..... and I see what you mean.... Im taking the opposite of everything and solving it that way? :)

Answer 11

$$5x^2 + 2x + 11+ (- 7) +(- 4x) + (2x^2)$$

Answer 12

Ok I think I got it!!!
7x^2-2x+4

Answer 13

Im most likely wrong but hey I tried lol

Answer 14

You are right!

Answer 15

Lol thats a first.... can i ask you another one?? :) Please..

Answer 16

sure

Answer 17

Find the difference.

(6x^3 + 7x + 12) - (3x^2 + 8x + 8)
Ok I think its
3x^3+x+4

Answer 18

$$ (6x^3 + 7x + 12) - (3x^2 + 8x + 8)=6x^3 + 7x + 12 +(-3x^2) + (- 8x) + (- 8)$$

Answer 19

Check the term +x in your answer

Answer 20

$$7-8$$

Answer 21

Ok -1x???

Answer 22

Sorry that was a really stupid mistake......

Answer 23

Carefully write out your work will help imo :)

Answer 24

Ok, sorry! Can I ask you another one???

Answer 25

To subtract polynomials you add the opposite of each term and then simplify.

Answer 26

I know but will you check my answer???? Please......

Answer 27

sure

Answer 28

Just remember: $$\Huge\text{add the opposite of each term}$$

Answer 29

Ok ok ok,
Find the difference.
(3 - 13x - 7x2) - (5x^2 + 12x - 10)
So I would be:
-12x2 - x - 7
I DID ADD THE OPPOSITE OF EACH TERM AND DOUBLE CHECKED MY MATH THIS TIME!!!! I swear!!!!!!!!!

Answer 30

Oh I forgot the exponent symbol -12x^2 - x - 7

Answer 31

:,(

Answer 32

Oh I did it wrong again i'm sorry....... but uhhhhhhhhhhhhh mat is way to hard.... see I was good at math until they started mixing in all of these letters then I just got bad

Answer 33

-12x^2 - 25x - 7

Answer 34

Check the constant please...

Answer 35

-12x^2 - 25x + 13???

Answer 36

Correct :D

Answer 37

:) Hold on..... im going to do it right this time.... I mean it has to happen sooner or later lol.
Find the SUM.
(6x^2y + 4xy^2 - 2y^3 + 6) + (x^2y + 3y^3 - 5)
7x2y + 4xy2 + y3 - 11
I think I did the thing right....

Answer 38

Wait is it 7x^2y + 4xy^2 + y^3 + 1
Yeah im going with that one

Answer 39

Correct :D

Answer 40

Yeah! You can just tell me when you don't want to check\help me anymore because I have a lot of these....
Find the sum.

(2a^2 + ab + 2b) + (4a^2 - 3ab + 9)

These one i'm not sure about the first term on both sides because you could add the exponets right?

Answer 41

6a^2+2ab+2b+9 I THINK

Answer 42

Correct! They exponents only change when multiplying.

Answer 43

Thank, you:
(3x^2 + x + 5) + (2x^2 + x - 2)

My answer: 5x^2+2x+3

Answer 44

Correct!

Answer 45

yeah!!!!! This one im a little more.... uh not sure about:
Add the polynomials below.
(6x^3 + 8x^2 - 2x + 4) + (10x^3 + x2 + 11x + 9)
16x^3+10x^2+13????

Answer 46

:'(

Answer 47

Write your work out and circle and underline similar terms.

Answer 48

Oh I did it again is it......
16x^3+9x^2+9x+13????

Answer 49

Ok hold on

Answer 50

Ok I did it on my white board but I don't know how to do it on here...... :( when I did that I got:
16x^3+9x^2+9x+13

Answer 51

Correct :D

Answer 52

Oh yeah!!!!!!! Find the sum.
(3a^2 + 2ab + 2b) + (5a^2 - 3ab + 9)
I think its 8a^2-ab+2b+9

Answer 53

Correct :D

Answer 54

Yeah!!! Im getting better at this:
3x(2x + 4y)
Im not sure......

Answer 55

Because I did the term thing and 2x+4y are different so I cant add them..... Idk what to do

Answer 56

Leave multiplication alone until you master addition and subtraction imo

Answer 57

Try looking up polynomial addition and subtraction on Youtube's Khan academy

Answer 58

I cant its blocked my school blocks everything......

Answer 59

They overlooked this hehehehe...... but ok I can look it up on Mathopolis or something thanks for your help! :)

Answer 60

thanks for trying so hard to learn something new, great work!

Answer 61

Thank you! :)