Hi

x^3 + 2x^2 -1 = 0  |x = -1 one solution

Using Synthetic Division

-1	1	2	0	-1

		-1	-1	 1

	1	1	-1	 0

(x+1)(x^2 +x - 1) 

x^2 +x - 1





x = -1, -.5 ± √5 



 

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