algebra 2
posted by daniella .
What is the third–degree polynomial function such that f(0) = –18 and whose zeros are 1, 2, and 3

The zeroes are 1, 2, and 3, so the factors are (x1), (x2), and (x3). Those are 3 factors for a 3rd degree polynomial, so no other factors are needed.
f(x) = C*(x1)(x2)(x3), where C is any constant.
f(0) = 18 allows you to determine C.
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