Sunday, October 20, 2013

Given Find B so that AB = I = BA as follows: First equate entries on the two...

You need to multiply the matrices A and B such
that:



= ((1,0,0),(0,1,0),(0,0,1))



4c+3f+2i),(5a+6d+3g, 5b+6e+3h, 5c+6f+3i),(3a+5d+2g, 3b+5+2h, 3c+5f+2i)) =
((1,0,0),(0,1,0),(0,0,1))


Equating corresponding terms
yields:









1




= 0





You need to
consider the equations that contain a,d,g such
that:






0


You need to subtract the third equation from the first
such that:



You
need to multiply the first equation by 3 and the second equation by -2 and then you
should add the new equations such that:



3




- 3d = 3


You need to multiply the equation a - 2d = 1 by
-2 such that:



-2


Adding this equation to 2a - 3d = 3
yields:



2



3



-7


You need to consider the equations that contain b,e,h
such that:






0


Subtracting the third equation from the first
yields:



2e


Substituting 2e for b in the first and second equations
yields:




3h = 1


You need to multiply by 3 the equation 11e + 2h = 0
and by -2 the equation 16e + 3h = 1 such that:



0




-32e - 6h = 0-2



-4



11


You need to consider the equations that contain c,f,i
such that:






1



-1



1


Substituting 2f - 1 for c in the first and second
equations yields:





5



10



2



3



-9


Hence, evaluating the matrix B under
given conditions yields

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