Given the traveling wave (x, t) = 5.0 exp (-x 2 - bt 2 - 2b xt),

Given the traveling wave  Ψ(x, t) = 5.0 exp (-αx² - bt² - 2√αb xt), determine its direction of propagation. Calculate a few values of Ψ and make a sketch of the wave at t = 0, taking α = 25 m^-2 and b = 9.0 s^-2. What is the speed of the wave?