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These are linear algebra problems.

1 4 1 1 2 7 2 2 Let A 1 4 .. 1 2 find Its Inverse. Decide whether the matrix A is invertible, and if so, use the adjoint meth

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A 467 /422 2T 2 2 7 2 2 2 2 G 7 12 y 2 2 2 (-7) - ) -u x(-6 (-20) 24-3 +2 in ventible dut A o by coetor Bind invor Now -2o 62 u 6 7 и ич C21( m2 1 -3 M22 6 7 -3 242 (-1)2 C22 u l u 7 uu M24- 1 u6 C31 1 2 2 2 3 2 O ut =-3 27 2 чч 3t3 - 32 7 2 3+4 C34 Ihu 2 2 u 67 Cu Ihu 1 1 zhul 2 2 2 G7 Cu2 -Ft2 muz = o hu 2 7 -6 Cu 3 t3 Mu3 - 1 S 7 2 u 6 -5 Muy- CI3 Cr4 -20det A 3 - 1 C 2 2 a 二2 e f -2b -2c -2a -2C -2 b Now -20 - 2C e f -2 b 2 a d -3d -3e 3t h-3e 9-3d C 3) 2 e f -2 d d e tw rowhvdet A 3 - 1 C 2 2 a 二2 e f -2b -2c -2a -2C -2 b Now -20 - 2C e f -2 b 2 a d -3d -3e 3t h-3e 9-3d C 3) 2 e f -2 d d e tw rowhv

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