I know the answer because I searched it up but I don't know the steps. Anybody willing to help please? I have attached the image in case you can't understand what I wrote :)))

Find the variables.

[ −12 −w^2 [2k -81
2f 3 ] = -14 3


I Know The Answer Because I Searched It Up But I Dont Know The Steps Anybody Willing To Help Please I Have Attached The Image In Case You Cant Understand What I class=

Answer :