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Sep
7
asked For what values of $p$ and $b$ is the vector $(b,8,b+7)$ a solution of this system?
Sep
5
accepted Determining the values of $b$ in $Ax=b$ to have a consistent system.
Sep
5
asked Determining the values of $b$ in $Ax=b$ to have a consistent system.
Sep
1
accepted Is $A$ invertible if $ABAB^2 = I$?
Sep
1
comment Is $A$ invertible if $ABAB^2 = I$?
Only of the same size?
Sep
1
asked Is $A$ invertible if $ABAB^2 = I$?
Sep
1
asked Why does a matrix column being a multiple of another imply that the matrix is singular?
Aug
27
awarded  Popular Question
Aug
21
accepted Factoring $x^3-8$ by grouping
Aug
21
comment Factoring $x^3-8$ by grouping
@Winther that works - but how did you figure that? Just made up?
Aug
21
comment Factoring $x^3-8$ by grouping
Sorry, how did you realize that $x^3 - 8 = (x^3 + 2x^2 + 4x) + (-2x^2 - 4x - 8)$?
Aug
21
asked Factoring $x^3-8$ by grouping
Jul
7
accepted Finding two matrices that permit a change of variable eliminating the crossed term.
Jul
7
asked Finding two matrices that permit a change of variable eliminating the crossed term.
Jul
6
accepted Surjective linear transformations: is checking for linear independency enough?
Jul
6
accepted Gram-Schmidt: Do the sets have some sort of order?
Jul
6
asked Surjective linear transformations: is checking for linear independency enough?
Jul
6
asked Gram-Schmidt: Do the sets have some sort of order?
Jul
5
accepted Calculating an orthonormal base given another base.
Jul
5
comment Calculating an orthonormal base given another base.
Aha, this worked! I'll keep on testing it. Do you know why my particular approach didn't work?