Find the values of \( a \) and \( b \) so that the polynomial \( x^{3}-a x^{2}-13 x+b \) has \( ...

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Find the values of \( a \) and \( b \) so that the polynomial \( x^{3}-a x^{2}-13 x+b \) has \( (x-1) \) and \( (x+3) \) as factors.
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