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![x^5-8x^3-9x\\\\[Factor]x(x+3)(x-3)(x^2+1)\\\\[Set all the items equal to 0.]x = 0\\\\x+3=0\\x=-3\\\\x-3=0\\x=3\\\\x^2 +1=0\\x^2=-1\\x=i,-i](/tpl/images/0514/1729/f83c3.png)
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- f(x) = x^5 – 8x^3 – 9x (find all zeros/roots)...
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