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Sep
19
accepted Proving $\lim_{x\to1}(x^2+3)=4$
Sep
19
comment Why does $|x-1|^2+3|x-1| < \epsilon \implies |x-1|^2 < \frac{\epsilon}{2} \ \ \land \ \ 3|x-1| < \frac{\epsilon}{2}$?
@Oleg567: What if $a = b = \epsilon/2$?
Sep
19
asked Why does $|x-1|^2+3|x-1| < \epsilon \implies |x-1|^2 < \frac{\epsilon}{2} \ \ \land \ \ 3|x-1| < \frac{\epsilon}{2}$?
Sep
19
asked Proving $\lim_{x\to1}(x^2+3)=4$
Sep
12
asked Determinant of a matrix with trigonometry functions.
Sep
7
asked Determining what values in a system can cause infinite/unique/no solutions.
Sep
7
comment For what values of $p$ and $b$ is the vector $(b,8,b+7)$ a solution of this system?
Thanks, that's right (although $b$ yields $-5$).
Sep
7
accepted For what values of $p$ and $b$ is the vector $(b,8,b+7)$ a solution of this system?
Sep
7
comment For what values of $p$ and $b$ is the vector $(b,8,b+7)$ a solution of this system?
@Adriano: Huh, it seems it should be $b = -5$. The exercise's answer seems to be wrong haha.
Sep
7
revised For what values of $p$ and $b$ is the vector $(b,8,b+7)$ a solution of this system?
added 1 character in body
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?