If zero of the polynomial xcube - 16xsquare + 11x + 364 are (a-b) , a (a+b) find a and b

If zero of the polynomial xcube - 16xsquare + 11x + 364 are (a-b) , a

1.	If zero of the polynomial xcube - 16xsquare + 11x + 364 are (a-b) , a (a+b) find a and b
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