Consider the following second-order ODE: d^2y/dx^2 = y + x^2 (a)Using the central difference formula for approximating the second derivative, discretize the ODE (rewrite the equation in a form suitable for solution with the finite difference method). (b)If the step size is h = 1, what is the value of the diagonal elements in the resulting matrix of coefficients of the system of linear equations that has to be solved?