Find a rational zeros of the polynomial function and use it to find all the zeros of the function.   ​f(x)=x3+6x2+16x *** I got x=-2   (when doing the synthetic division I keep ending up with 4 numbers at the bottom. -2 does not make it a trinomial even though it is a rational 0)   -2   1  6  16  16           4  -20  8 -----------------  -2x^3+10x^3-4x^2+24     hope this makes sense

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.