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(2x+1)(3xsquared-2x-5)

Guest Feb 11, 2015

Best Answer 

 #1
avatar+1090 
+10

When typing, use this notation for power "^2"

So we have:

(2x + 1)(3x^2 - 2x - 5)

Let's use the box method of multiplication for explanation:

       3x^2    -2x      -5    

2x | 6x^3 | -4x^2 | -10x

1   | 3x^2 | -2x     | -5

 

Since we've multiplied all of the terms using a box, now we can add them all together:

6x^3 + 3x^2 - 4x^2 -2x - 10x - 5

 

After combining like terms, we have: 6x^3 - x^2 -12x -5

Mathematician  Feb 11, 2015
 #1
avatar+1090 
+10
Best Answer

When typing, use this notation for power "^2"

So we have:

(2x + 1)(3x^2 - 2x - 5)

Let's use the box method of multiplication for explanation:

       3x^2    -2x      -5    

2x | 6x^3 | -4x^2 | -10x

1   | 3x^2 | -2x     | -5

 

Since we've multiplied all of the terms using a box, now we can add them all together:

6x^3 + 3x^2 - 4x^2 -2x - 10x - 5

 

After combining like terms, we have: 6x^3 - x^2 -12x -5

Mathematician  Feb 11, 2015
 #2
avatar+92699 
0

Thanks, Mathematician....I like that method !!!

 

CPhill  Feb 11, 2015
 #3
avatar+1090 
+3

Yep, it's the first method my school taught me (just recently), but using distribution is less time consuming.

Mathematician  Feb 11, 2015
 #4
avatar+92699 
+3

I dunno'...this method seems pretty "clean'.....you can follow the "diagonal" pattern to combine like terms......!!!

 

CPhill  Feb 11, 2015
 #5
avatar+1090 
+3

It is definitely very accurate because of its display; however by "going down the line" in distribution, one can combine like terms in the same way.

 

It is a good method for teaching, but in practice, I use distribution.

Mathematician  Feb 11, 2015
 #6
avatar+18 
0

i like the method. it seems kind of easier lol..

HappyBJ  Feb 11, 2015
 #7
avatar+92699 
0

Yep...me, too.....HappyBJ.....!!!

 

CPhill  Feb 11, 2015
 #8
avatar+18 
0

u mean BJ? LOL

HappyBJ  Feb 11, 2015
 #9
avatar+1090 
0

I guess it's sort of a number sense mentality to want to problems faster rather than with accuracy and ease...

 

Academic U.I.L. is fine ingrained within my mind now.

Mathematician  Feb 11, 2015
 #10
avatar+3691 
0

here i am again!

BrittanyJ  Feb 11, 2015
 #11
avatar+92699 
0

I can't call you BJ....that one is "reserved" for BrittanyJ.....!!!!

I might use HBJ.....how does that sound???

 

CPhill  Feb 11, 2015
 #12
avatar+3691 
0

hey, Mathematician! wat about "M&M" for nickname? LMAO!

BrittanyJ  Feb 11, 2015
 #13
avatar+3691 
+3

ummm hello???? CPhill??? (ill let u think about this "BJ-nickname" situation.. lol

BrittanyJ  Feb 11, 2015
 #14
avatar+92699 
+3

Hey, Mathematician..you should feel honored..BJ just gave you your "forum name'...that OFFICIALLY accepts you into the "pack'  !!!

MatheMatician  =  M & M   !!!!

 

CPhill  Feb 11, 2015
 #15
avatar+3691 
0

Chris, have u figured out who HappyBJ is?

BrittanyJ  Feb 11, 2015
 #16
avatar+1090 
0

That was nice... I think I'll accept that name (or that name will be accepted upon me for me.)

Mathematician  Feb 11, 2015
 #17
avatar+92699 
+3

No clue.....maybe he's related to LBJ....!!!!

 

CPhill  Feb 11, 2015
 #18
avatar+3691 
+3

same person, chris... same person LOL

BrittanyJ  Feb 11, 2015
 #19
avatar+94106 
0

I have not seen mathematician's method before either but I do like it!!

Melody  Feb 11, 2015

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