For this case we have the following polynomial: [tex]-2x ^ 4 + 27x ^ 2 + 1200 = 0[/tex] To solve the problem we apply the following steps: 1) We make a change of variables u = x ^ 2 2) We rewrite the polynomial 3) Solve the quadratic equation using the formula for the quadratic equation 4) We return the change and find four roots Answer: See attached image for procedure and solution