math (Matrix) 2

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if (-2 1 x+2 )
(3 x-4 5 ) =25
(0 1 3 )


a) find the value of x

b) hence ,find (-2 1 x+2 )^-1
( 3 x-4 5 )
(o 1 3 )

p/s : all the value above IS COMBINE in one bracket ( )

  • math (Matrix algebra) -

    solve the equations by using
    a) the adjoint matrix
    b) elementary row operations

    i) x+y+z=6
    2x-y+z=3
    x+4y-z=6

    ii) 3p-3q+r=1
    -3p+5q-2r=-1
    p-2q+r=3

    iii)-12a+b+17c=-14
    2a-b+3c=5
    8a+b-13c=-3

    thanks sir/madam

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