MHB What is the Common Core method for solving 2x + 3x?

  • Thread starter Thread starter mathdad
  • Start date Start date
mathdad
Messages
1,280
Reaction score
0
When we add 2x + 3x the answer is 5x.

Commore Core Way:

2x + 3x = what?

2 = 3 - 1

3 = 4 - 1

5 = 6 - 1

x = x^1

(3 -1)(x^1) + (4 - 1)(x^1)

Answer:

(6 - 1)(x^1)

Ridiculous! Agree?
 
Mathematics news on Phys.org
You have repeatedly stated a number or things without giving any indication of where you got them. I have dealt with "common core" for some time and I have never seen anything like what you give. Where did you see this? Can you give a citation or, better, a "common core" website that says that?

I will say that what you give would be a ridiculous way to actually calculate, I could see it as a way of introducing students to algebraic ideas, relating the to arithmetic. Letting us see where you saw that would help us determine exactly what the purpose was.
 
My friend's daughter was given 2x + 3x to add for homework via Common Core in her 6th grade class.
 

Thread 'What Exactly is Dirac’s Delta Function? - Insight'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
View full post »

Thread 'Fermat's Last Theorem'

Fermat's Last Theorem has long been one of the most famous mathematical problems, and is now one of the most famous theorems. It simply states that the equation $$ a^n+b^n=c^n $$ has no solutions with positive integers if ##n>2.## It was named after Pierre de Fermat (1607-1665). The problem itself stems from the book Arithmetica by Diophantus of Alexandria. It gained popularity because Fermat noted in his copy "Cubum autem in duos cubos, aut quadratoquadratum in duos quadratoquadratos, et...
View full post »

Thread 'Useless continued fraction for 1'

I'm interested to know whether the equation $$1 = 2 - \frac{1}{2 - \frac{1}{2 - \cdots}}$$ is true or not. It can be shown easily that if the continued fraction converges, it cannot converge to anything else than 1. It seems that if the continued fraction converges, the convergence is very slow. The apparent slowness of the convergence makes it difficult to estimate the presence of true convergence numerically. At the moment I don't know whether this converges or not.
View full post »

Similar threads

B About a definition: What is the number of terms of a polynomial P(x)?
Replies
48
Views
3K
MHB Equation 2: Prove that ##x^2+2x\sqrt x+3x+2\sqrt x+1=0##
Replies
4
Views
1K
MHB Solving $\tan^2x + \tan^2{2x} + \cot^2{3x} = 1$ in R
Replies
6
Views
1K
MHB Quadratic equations ( solving for zeros/roots) trickey
Replies
1
Views
1K
MHB Absolute Value Equation |3x - 2|/|2x - 3| = 2
Replies
10
Views
2K
B Given an equation, find the value of this expression
Replies
17
Views
2K
A Rich "isotropic tensor" concept
Replies
1
Views
2K
MHB Inequality solve (x+1)/6<x-(3x-2)/4
Replies
2
Views
1K
MHB Fixed point,, Jacobi- & Newton Method, Linear Systems
Replies
7
Views
2K
MHB Is x+1 a Factor of the Polynomial x^3-5x^2+3x+1?
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top