Check Your Answers with Visual Aids: Q & A Pictures Included"

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The discussion centers around the use of visual aids to present answers to a question, with multiple image links provided for both the question and the answer. A participant points out a mistake in the calculations, specifically noting that the product of A-1 and A should yield the identity matrix I, indicating an error in the process. The emphasis is on the importance of verifying calculations through visual checks. The conversation highlights the utility of images in illustrating mathematical solutions. Accurate verification is crucial in problem-solving to avoid errors.
r-soy
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Hi

here I put my answer as a picture

Q

[PLAIN]http://up.arab-x.com/Mar10/HnA33086.jpg

A

[PLAIN]http://up.arab-x.com/Mar10/8SE29265.jpg

http://arb-up.com/i/00020/a00rnukl7nt0.jpg

http://arb-up.com/i/00020/88tl6yd7jk3p.jpg

http://arb-up.com/i/00020/2d5d712yhh03.jpg
 
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r-soy said:
Hi

here I put my answer as a picture

Q

[PLAIN]http://up.arab-x.com/Mar10/HnA33086.jpg

A

[PLAIN]http://up.arab-x.com/Mar10/8SE29265.jpg

http://arb-up.com/i/00020/a00rnukl7nt0.jpg

http://arb-up.com/i/00020/88tl6yd7jk3p.jpg

http://arb-up.com/i/00020/2d5d712yhh03.jpg

You have obviously made a mistake somewhere, either in the inverse or in your check. When you multiplied A-1 by A, you should have gotten the identity matrix I, but you didn't. That should be a clue that you've done something wrong.
 
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