Find all real solutions to the equation
x^4 - 40x^3 + 600x^2 - 4000x + 9375 = 0
Factor is to get (x−5)(x−15)(x2−20x+125) which has solutions of x=5,x=15,x=10−5i,x=10+5i
real solutions would be x=5, x=15. complex solutions would be x=10-5i, x=10+5i
+178 
