Algebra
posted by Brent .
find all zeros, write polynomial as product of linear factors
1) f(x)=9x^3  x^2 +9x 9
2) f(x)=x^4 21x^2 100
3) f(x)=x^3 3x^2 5x +39

Algebra 
Steve
#1 There must be a typo here. Not factorable
#2 (x^225)(x^2+4)
now it should be easy
#3 a little tinkering shows that you have
(x+3)(x^26x+13)
again, complex roots.
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