Question 189342
Plot the graph of y= x3- 1.5x2- 8.5x +4.5 from x= -4 to x= +4 at 1 unit intervals, and use the graph to solve the equation  x³-1.5x2 -8.5x + 4.5= 0
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I did that.  I use the graphing software from www.padowan.dk.com/graph/  (it's free)
I suspected that 0.5 is a zero because of the fractions in the equation, and it is.
Multiply the eqn by 2, then, after dividing by (x-1) you have 
2x^2 - x - 18 = 0
*[invoke solve_quadratic_equation 2,-1,-18]