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did you square it?

like 3^2?

i mean square the matrix

i got
\[\left[
\begin{array}{ c c }
x^2+3y & 3x+9 \\
xy+3y & 3y+9
\end{array} \right]\]

assuming the matrix is
\[\left[
\begin{array}{ c c }
x & 3 \\
y & 3
\end{array} \right]\]

that means
\[3x+9=3\] so \[x=-2\] and also \(y=-2\)

once you square the matrix, how do you determine the x and y values though?

oh nevermind. how'd you get 3x+9=3

assuming my squaring is correct

so that means each entry has to be the same for the matrices to be equal

sorry i meant \(3y+9=3\implies x=-2\)

ohhh okay!

you can check that this is right by squaring and seeing that you get the same matrix back

also you might want to check that i squared the matrix correctly, but i think it is right

gotta run

when it said A^2=A I first thought it mean like x^2 and 3^2.. i haven't learned this yet lol