order4dWe can solve a second order differential equation of the type: d 2 ydx 2 + P(x) dydx + Q(x)y = f(x). where P(x), Q(x) and f(x) are functions of x, by using: Undetermined Coefficients which onlyWe have already covered this topic at JDM Plates in another article – however, we are happy to touch on this subject again! 4D acrylic number plates are completely legal in the UK, so long