y=2x^3-7x+5		CE: x R

	2 0   -7    | 5
      1	  2*1  2*1  |
	2  2   -5   | 0

INTy: 2x^3-7x+5=5
INTx: 2x^3-7x+5=0

(x-1)*(2x^2+2x-5)

x=1
x=+-V44/4

CE
(x-1)*(2x^2+2x-5)>0
	        -   +	    -      +
x>1		      o_____________________ _ _ _
x>+-V44/4  _ _ ___o             o________ _ _ _

y'=6x^2-7>0