Hello everyone, I have a problem...(adsbygoogle = window.adsbygoogle || []).push({});

I am suppose to Find the value of k for which the matrix:

A =

-4 9 14

2 7 16

-7 -2 k

has rank 2.

k = ?

I row reduced until i couldn't do it anymore and i got the following:

-4 9 14

0 23 46

0 0 92k + 2116

now i'm lost on how i'm suppose to find a value for k that will make this mantrix rank 2. ANy help would be great

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Matrices trouble, finding k so matrix is rank 2

**Physics Forums | Science Articles, Homework Help, Discussion**