How to get x by itself in equation 4x* (-200)=400^2

1. Square 400
2. Add 200 to each side
3. Divide by 4
4. Boom. There's your answer.

4x * (-200) = 400^2    Divide both sides by -200

4x = 400^2/(-200)      divide both sides by 4

x = 400^2/(-800)

x= - 200