Learn the formula for multiplying two 3×3 matrices:
It follows a pattern, which you must learn:
Notice that the red numbers go down in the original
matrix and also go down in the product matrix, whereas
the green numbers go down in the original matrix but
go across in the product matrix. Study the pattern
carefully until you have it down. Then try this:
Now see if you can do that by yourself. After you fill in the
numbers, then simplify all the expressions until there is just 1
number for each element. If you have trouble, tell me in the
thank-you note form below and I'll get back to you by email to
help you. (No charge ever!)
Edwin
