'points) Find basis for null( A) where: A = What is dim (null( A))?'
Added by Joshua L.
Step 1
To do this, we can row reduce the augmented matrix [A|0]: [1 2 -1 0] [2 4 -2 0] [-1 -2 1 0] R2 - 2R1 -> R2 R3 + R1 -> R3 [1 2 -1 0] [0 0 0 0] [0 0 0 0] We can see that the second and third columns are free variables, so we can express the solutions in terms of Show more…
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