(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the determinant of the following matrix:

4.....0.....1

19...1....-3

7.....1.....0

I chose the 1st row to do the operations on.

4 [(1*0) - 1*(-3)] + 1 [19*1 - 7*1]

= 4[0 - (-3)] + 1[12]

=12 + 12

=24

I can't see any mistakes in that, but it's apparently wrong. The answer is supposed to be 0. Here's the thing, for some rows/colums, the answer comes out to be 24, while for other rows/colums, the answer is 0. Shouldn't it not matter which row/column you choose? So why am I getting different answers?

For example, if I choose the 3rd column...

1 [19 - 7] - 3 [4 - 0]

= 12 - 12

= 0

So why am I getting different answers?

**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: Finding a determinant

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