## How to get this table from (x-a) * (x-b), where a> b?

I try to get a table (x-a) * (x-b), from where a> b, I tried

table[{(x - a) (x - b)}, {a, 5}, {b, 5}]


If I have used

table[{(x - a) (x - b)}, {a, 5}, {b, 5}, {a > b}]


I can not get the result. How can I get the right result?

## Optimal Control – The question is that (A, b) Iff can be controlled. every square matrix X of order n such that AX = XA and Xb = 0 satisfies X = 0

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