Multiplying Polynomials

3/7/2016

Piper

3/8/2016 12:35:04 pm

the polynomial is -10x(squared) + 11x - 3 The negative didn't make it hard, it made it easier because 2 negatives cancel each other out. I used F.O.I.L. method

Mr. Bigsby

3/9/2016 07:52:45 pm

Correct! Good reasoning.

Emily Ritzes

3/8/2016 01:45:05 pm

The polynomial is -10x^2+11x-3. I used the box method.

5x -3

-2x -10x^2 6x

+1 5x -3

then i combined like terms (6x+5x+11x) and wrote the new polynomial -10x^2+11x-3.

Mr. Bigsby

3/9/2016 07:54:22 pm

Correct! Good explanation even though the box is hard to show in the comments.

Emily Ritzes

3/8/2016 01:49:48 pm

uggghhhhh it got messed up!!!!!

Viola

3/8/2016 02:52:23 pm

I'll stop screaming now

Mr. Bigsby

3/9/2016 07:55:12 pm

Thanks!

Rose

3/8/2016 02:55:10 pm

Hi
Did it

Hazel

3/8/2016 05:00:45 pm

I used both methods, here is the foil method:
1. First
(5x)(-2x)=-10x^2

2. Outer
(5x)(1)=5x

3. Inner
(-3)(-2x)=6x

4. Last
(-3)(1)=-3

So, the simplified answer is -10x^2+11x-3

Question- So, I know that the algebra blocks were too confusing and we didn't use them, but during the PowerPoint, I had a question. When x, a bar was multiplied by another x, another bar, they created a square...makes sense. But, what if those x values were equal to one? One times one equals one, so the bar would stay a bar and not become a square...right?

Mr. Bigsby

3/9/2016 07:57:55 pm

Great explanation using FOIL.

Emily is correct that it would just make a square with side lengths of 1. The tiles just show x as a row because it represents some mystery side length we don't know, but it could be 1.

Emily Ritzes

3/8/2016 05:15:47 pm

I get what you are saying Hazel. But when you multiply x by x, you get x^2, and it would create a square which would have sides equaling x. Try using the box to help. x times x equals x^2 , so 1 times 1 would equal 1^2 which would create a square with sides of 1. Did that help? Idk if i'm right but that is how I see your question.
I tried.

Julianna

3/8/2016 05:56:51 pm

Nice video

Jaelyn

3/8/2016 07:34:21 pm

I like this video . Also does it matter if u either to the table way or the F. O. I. L way ?

Mr. Bigsby

3/9/2016 07:58:26 pm

Nope, both ways give you the same answer.

Zoe

3/8/2016 08:07:55 pm

Good viseo

Zoe

3/8/2016 08:08:16 pm

Video*

Alexis Kahler

3/9/2016 04:21:42 am

-10x^2+11x-3

I like your TMNT shirt!

Mr.Bigsby

3/9/2016 07:59:09 pm

Thanks! And your correct!

Erica

3/9/2016 01:11:46 pm

I played a monopoly game that kind of got out of hand. We started calmly like normal people, but in the end, people robbed the bank, threw game pieces across the room, and started a civil war over the remaining land.

Krissy

3/9/2016 01:58:19 pm

hola

Karli

3/10/2016 03:18:37 pm

Ok💥👌

fletcher

3/10/2016 05:53:43 pm

i have a question mr bigsby. will we learn how to divide polynomials? it seems easy enough wouldn't you do the same thing as multiplication but instead of multiplying everything you would just divide it?

for example, (2x)= x=13
(2)+(13)

Mr. Bigsby

3/11/2016 06:39:19 am

We are kind of dividing when we factor but direct dividing would use the distributive property.

(3x^2 + 15x + 6) / 3 =

Use distributive property

3x^2 / 3 = x^2
15x / 3 = 5x
6 / 3 = 2

x^2 + 5x + 6

Justin Maddox

3/13/2016 08:16:04 am

I was kinda confused in class but that made it easier

Amna Syed

3/14/2016 01:20:30 pm

Logan

3/14/2016 02:15:32 pm

Larry is real

*drops mic*

Georgia

3/14/2016 04:35:52 pm

Cool bro

Megan

3/16/2016 05:37:27 am

Ok :)

maddox

3/16/2016 12:12:06 pm

hello

Ally Carter

3/17/2016 03:53:28 pm

Nice video!!!

Emmily

3/18/2016 07:10:02 am

Mr Bigsby is the best!

Amna

3/27/2016 08:16:49 am

I needed extra credit so I asked a question late..
What if u cant find any solutions will u call it prime?

Hammy

4/6/2016 01:38:19 pm

Pizza rolls

Sarina Long

4/6/2016 03:03:37 pm

Kendle

4/7/2016 07:56:50 pm

The box method is definitely my favorite

Multiplying Polynomials

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