- #1

courtrigrad

- 1,236

- 2

1 & 2 & 3 \\

-1 & 2 & 1 \\

4 & 1 & -1 \\

\end{array}\right)[/tex]

and we want to zero the entries in the second row of

**A**(i.e. make it

**0 0 1**).

How do we get [tex] A =\left(\begin{array}{ccc}

4 & -4 & 3 \\

0 & 0 & 1 \\

3 & 3 & -1 \\

\end{array}\right)[/tex]?

I have tried using elementary row operations:

[tex] A =\left(\begin{array}{ccc}

1 & 2 & 3 \\

-1 & 2 & 1 \\

4 & 1 & -1 \\

\end{array}\right)[/tex]

[tex] A =\left(\begin{array}{ccc}

1 & 2 & 3 \\

0 & 4 & 4 \\

4 & 1 & -1 \\

\end{array}\right)[/tex]

But then it just gets more complicated.

Any help is appreciated.

Thanks