calculus
posted by Jimmycan someone please help .
find the complex zeros of the polynomial function. write f in factored form.
f(x)=x^310x^2+42x72
please show work.

calculus 
Steve
all rational roots will be factors of 72. Trying a few values, we get 4 as a root.
f(x) = (x4)(x^26x+18)
use the quadratic formula for the complex roots.
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