This came about from some lunchtime fun a couple of days ago – we had an empty whiteboard and a boardpen: it was the logical thing to do.

Now produce the matrix of minors

Use the alternating law of signs to produce the matrix of cofactors

Transpose

The grand formula:

I suggest you print it out and put it on your bedroom ceiling…

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This has some errors. The determinant is wrong; also the first row should have be

(ei – fh) (ch – ib) (bf – ce)

Sorry, made some typos when copying it out. Will correct.

Edit: think that’s all corrected now. Oops :P

THANKS :)

this site helped me so much in making a matrix program

haven’t seen a site that gives a single formula like this

the only other way would have been programming through that whole process of finding the determinant and minor cofactors and dividing and and and … well, that would have been so tedious :P

SO THANKS :D

thanks for the 3×3 inverse squatrix formula. It really helped a ton!

just wondering, what would be the correct determinant for this squatrix?

The determinant is now fixed I think, yeah.

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thanks dude…..

thz 4 helping..finally i can solve it easily^^thank you so much^^