Question

I think its A but im not sure.. can you guys help me and explain why? ill attach the pic in a sec.Which of the following addition problems could be modeled by the algebra tiles shown below? Assume that no zero pairs have been removed yet.


A. (2x2 + 4x + 5) + (−5x2 + 2x − 3)
B. (−2x2 + 5x − 5) + (−x2 + 3x + 3)
C. (−x2 + 3x − 3) + (−2x2 + 3x + 5)
D. (−x2 + 8x − 3) + (−2x2 − 2x + 5) http://www.explorelearning.com/ELContent/gizmos/ELMath_Deliverable/ExplorationGuides/Algebra/images/EL_A1_PolyAdd2.gif

Answer 1

wow I have no idea what that picture means

Answer 2

well, I have an idea, but....
I'm not sure why the -x^2 are seperated

Answer 3

I guess that's A.

Answer 4

But damn, this is a strange looking question.

Answer 5

oh I see what you mean
yeah I can't explain that, so I'll just have to say I agree with bmp

Answer 6

I guess you can say
"if you add the blocks and the algebraic expressions for A the terms match"
bizarre Q

Answer 7

I just don't get that D seems the same.

Answer 8

But yeah, that's basically what I did, haha.

Answer 9

so there are two answers

Answer 10

?
oh well, gotta teach english :(
later!

Answer 11

Later. But there are three I guess. C is the same. Dude, this is way too weird.

Answer 12

I know im soooo confused!!
because they all seem ok

Answer 13

I was gonna go for A but then i got confused :S

Answer 14

The correct answer is C.
(−x2 + 3x − 3) + (−2x2 + 3x + 5). There are no zero pairs of x2 -tiles so the x2 terms of both polynomials must each be negative for a total of −3x2. There are also no zero pairs of x-tiles so the x terms of both polynomials must each be positive for a total of 6x. The 1-tiles and the −1-tiles indicate that the final terms of the polynomials must be +5 and −3. The only answer that matches all of these conditions is (−x2 + 3x − 3) + (−2x2 + 3x + 5).