Im trying to find the real root of the equation 0.8x^3-4.2x^2+12.7=0. It is between -2(x0) and -1(x1). My problem is when i try to put the starting values(x0, x1) back into the equation to get y0 and y1 i get incorrect answers... I am easily able to do an equation such as x^5+2x^2-5=0, but not this... Can any body help me? is there something i should be doing with the decimal numbers multiplying x in the equation?