def METHOD_NAME(self):
    # build the model
    prob = om.Problem()
    prob.model.add_subsystem('paraboloid',
                             om.ExecComp('f = (x-3)**2 + x*y + (y+4)**2 - 3'),
                             promotes_inputs=['x', 'y'])
    prob.setup()
    x = prob.get_val('x')
    prob.set_val('y', 15.0)