Respuesta :

if  -5 is a zero then f(x) is divisible by (x + 5)

the quotient when F*x) is divided by x + 5  is  :-
3x^2 - 10x + 3
this factors to 
(3x  - 1)(x  -  3)

so the answer is (x + 5)(3x - 1)(x -  3)  

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