Solve the equation by using the appropriate substitution. x^4-25x^2+144=0

A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation. Using this equation, find the time that the rocket will hit the ground, to the nearest 100th of second. y=-16x^2+148x+128y=−16x2+148x+128

2^32cos2x is not a correct solution for the equation submitted