4x5 - 12x4 + x3 - 52x2 - 60x - 16 = 0

You would star but add x's together witch will be - 59x then you will do the muplication witch would be 20-48-104-16=0 i add the subtracting together witch is - 168+20 know you would substract the - 168 with the - 20 witch was - 148/-59x=2.5