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satellite73
 one year ago
Best ResponseYou've already chosen the best response.1did you square it?

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1i mean square the matrix

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1i got \[\left[ \begin{array}{ c c } x^2+3y & 3x+9 \\ xy+3y & 3y+9 \end{array} \right]\]

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1assuming the matrix is \[\left[ \begin{array}{ c c } x & 3 \\ y & 3 \end{array} \right]\]

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1that means \[3x+9=3\] so \[x=2\] and also \(y=2\)

monroe17
 one year ago
Best ResponseYou've already chosen the best response.0once you square the matrix, how do you determine the x and y values though?

monroe17
 one year ago
Best ResponseYou've already chosen the best response.0oh nevermind. how'd you get 3x+9=3

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1you have \[\left[ \begin{array}{ c c } x^2+3y & 3x+9 \\ x^2+3y & 3y+9 \end{array} \right]=\left[ \begin{array}{ c c } x & 3 \\ y& 3 \end{array} \right]\]

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1assuming my squaring is correct

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1so that means each entry has to be the same for the matrices to be equal

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1therefore \(3x+9=3\implies x=2\) and \(3y+3=3\implies y=2\) and so the matrix must be \[\left[ \begin{array}{ c c } 2 & 3 \\ 2 & 3 \end{array} \right]\] by substituting back

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1sorry i meant \(3y+9=3\implies x=2\)

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1you can check that this is right by squaring and seeing that you get the same matrix back

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1also you might want to check that i squared the matrix correctly, but i think it is right

monroe17
 one year ago
Best ResponseYou've already chosen the best response.0okay:) So, the steps to a problem like this is to first follow the formula (A^2=A) for the matrix. Then just solve..

monroe17
 one year ago
Best ResponseYou've already chosen the best response.0when it said A^2=A I first thought it mean like x^2 and 3^2.. i haven't learned this yet lol
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