Which values of x would make a polynomial equal to zero if the factors of the polynomial were (x+3) and (x+12)

A product of factors is zero if and only if one or more of the factors is zero.  That is, if ab = 0, then either a = 0 or b = 0 (or both).

Hence (x+3)(x+12) = 0 only if (x+3) = 0 or (x+12) = 0 or both.  (x+3) = 0 when x = 3.(x+12) = 0 when x = 12.

Hence the values of x that make (x+3)(x+12) = 0 are x = 3 and x = 12.

8496 cars

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they can both be solutions depends on the equation

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what is the equation? ?