Question 899852
 <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
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 = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (-1 +- sqrt( 1+4))/(2) }}}
x = -1, -.5 ± &#8730;5 
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), 
circle(-1, 0,0.2),
circle(-1.618, 0,0.2),
circle(.618, 0,0.2),
graph( 300, 300, -6, 6, -6, 6,0,x^3 + 2x^2 -1 ) )}}}