Question 851785
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Hi,
{{{ 40=(2X+8)(4X)(X) }}}   x = 1 is a root, can expand to find the other two roots
{{{ 40=(2X+8)(4X)(X) }}} = {{{ 5=(X+4)(X)(X) }}} = x^3 + 4x^2 - 5
Using Synthetic Division to Find other two roots
1	1	4	0	-5			
		1	5	5
	1	5	5	0
      (x^2 + 5x + 5)    {{{x = (-5 +- sqrt( 5 ))/(2) }}} 
X is  -3.618,  -1.382 , 1