4. For each of the following two matrices, find the values of t for which the matrix is not
invertible. For each of those values of t, find a basis for the kernel of the corresponding
non-invertible matrix.
(a) [ t − 12 15 ]
[−6 t + 7 ]
(b)
[t − 17 9 −2]
[2t − 35 19 −4]
[2t + 2 −(t + 1) t − 1]

Question

4. For each of the following two matrices, find the values of t for which the matrix is not
invertible. For each of those values of t, find a basis for the kernel of the corresponding
non-invertible matrix.
(a) [ t − 12     15    ]
      [−6          t + 7 ]
(b)
[t − 17        9               −2]
[2t − 35      19            −4]
[2t + 2    −(t + 1)      t − 1]

anonymous · Answer

t=3 or t=2 the first matrix is not invertible

anonymous · Answer

More having trouble with the second one.

anonymous · Answer

step by step , you can do it. do you want to know how to do it or just need the result?

anonymous · Answer

I know how to do it the long way. It just leaves room for a mistakes.

anonymous · Answer

ok. try to do it by yourself. I can check after then

anonymous · Answer

I got some crazy answer. I am not really sure where I messed up.

anonymous · Answer

What do you get? I got -(2t^2+159t+465) =0