Opposite of transform.right

Hey, as the name suggests Im trying to work out how to get the opposite of transform.right:

if(Input.GetButtonDown("Horizontal") && HasPower == true)
{
    Player.rigidbody.AddForce(transform.right * MoveSpeed);
    HasPower = false;
}

this works fine but how do I get him to move left?

// Just add a minus sign in front of it...

Player.rigidbody.AddForce(-transform.right * MoveSpeed);