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anonymous
 one year ago
Need genius math people's help !!!!!
There are two matrices A and B.
A = 4 6 B= 5 1
4 2 1 3
I want to find a matrix D which satisfies A+B+D=I
and I got below the answer but it said still wrong.
8 5
3 6
Please help me people !!!!!!!!!!!!!!!!!
anonymous
 one year ago
Need genius math people's help !!!!! There are two matrices A and B. A = 4 6 B= 5 1 4 2 1 3 I want to find a matrix D which satisfies A+B+D=I and I got below the answer but it said still wrong. 8 5 3 6 Please help me people !!!!!!!!!!!!!!!!!

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sdfgsdfgs
 one year ago
Best ResponseYou've already chosen the best response.1I= 1 1 1 1 right? if so, then 8 and 6 are right, recalculate the other two.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Isn't I = 1 0 0 1 ???

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6yes a 2 x 2 identity matrix is 1 0 0 1

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6hmmm latex for matrices is nasty.. so we have this equation A+B+D=I where A and B matrices are given. so we need to find Matrix D

sdfgsdfgs
 one year ago
Best ResponseYou've already chosen the best response.1@taejunlee sorry u are right of cuz...been a while since i looked at matrix. so ur ans should be right then. may be someone else can help u. good luck! :)

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6what if we rearrange this equation for a bit D =IAB like that and then use matrix addition and matrix subtraction ?

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437187726707:dw

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6now use matrix subtraction. @taejunlee

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6blah...... we can start with the first two matrices and then that result  matrix B

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437188093151:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so isn't answer 8 6 2 6 ???

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6well let's check first... could you do the matrix in black (the one I drew) ?

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6excellent now we just need to do matrix subtraction with matrix b hold on a sec .. need to draw

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437188427336:dw

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6which is the matrix you got in the first place... it should be right then. Why is it wrong?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0well.. that was what I thought.. I better ask professor ..

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437188557694:dw

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6that should end up to 1 0 0 1

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6you got the right matrix. It must be some bug in the online homework or the professor's stupidity or something

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437188718111:dw

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6dw:1437188725475:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0guess there is something wrong with online system.. anyways I really appreciate what you've done for me :)

sdfgsdfgs
 one year ago
Best ResponseYou've already chosen the best response.1@taejunlee only thing i can think of is check the + signs in ur eqn n see if one may be a  instead.

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6@sdfgsdfgs he got the right matrix, so it wasn't the equation. It's some bug in his online stuff.

sdfgsdfgs
 one year ago
Best ResponseYou've already chosen the best response.1@UsukiDoll u are probably right  was just thinking may be the eqn should be A+BD=I or something like that instead.

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6^ matrix in latex is crummy, but thanks for the link. still I prefer to draw in this case.

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.1\[\begin{align} \textbf A+\textbf B+\textbf D &=\textbf I\\[2ex] \begin{pmatrix}4&6\\4&2\end{pmatrix} +\begin{pmatrix}5&1\\1&3\end{pmatrix} +\begin{pmatrix}d_{00}&d_{01}\\d_{10}&d_{11}\end{pmatrix} &=\begin{pmatrix}1&0\\0&1\end{pmatrix}\\[2ex] \begin{pmatrix}4+5&6+1\\41&23\end{pmatrix} +\begin{pmatrix}d_{00}&d_{01}\\d_{10}&d_{11}\end{pmatrix} &=\begin{pmatrix}1&0\\0&1\end{pmatrix}\\[2ex] \begin{pmatrix}9&5\\3&5\end{pmatrix} +\begin{pmatrix}d_{00}&d_{01}\\d_{10}&d_{11}\end{pmatrix} &=\begin{pmatrix}1&0\\0&1\end{pmatrix}\\[2ex] \begin{pmatrix}d_{00}&d_{01}\\d_{10}&d_{11}\end{pmatrix} &=\begin{pmatrix}1&0\\0&1\end{pmatrix}\begin{pmatrix}9&5\\3&5\end{pmatrix}\\[2ex] \begin{pmatrix}d_{00}&d_{01}\\d_{10}&d_{11}\end{pmatrix} &=\begin{pmatrix}19&0+5\\03&1+5\end{pmatrix}\\[2ex] \textbf D &=\begin{pmatrix}8&5\\3&6\end{pmatrix} \end{align}\]

UsukiDoll
 one year ago
Best ResponseYou've already chosen the best response.6wow that looks nice.

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.1\[\begin{bmatrix}\circ&&\circ\\&\angle\\&\smile\end{bmatrix}\]
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