Hi

F(x)=x^3+4x^2-9x-36  (x = 3 is a root)

Using Synthetic Division

3	1	4	-9	-36

		3	21	36

	1	7	12	0

(x-3)(x^2 + 7x + 12)

(x-3)(x+3)(x+4) =  0

Zeros are: -4,-3, 3

 

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