Acubic polynomial v = p(u) can be written x0 + x1 u + x2 u 2 + x3 u 3 . this question has to do with the least squares optimization to determine the unknown coefficients, xi, j=0,1,2,3. assume that you are given n data points {(uj, vj), j=1,2, …, n with n> 4. write the four linear equations produced by least squares and whose solution would give the values of the xi.

Which of the following is a difference between the systems development life cycle (sdlc) and extreme programming (xp)? the sdlc model has a separate planning and analysis phase, whereas xp combines both the phases into one phase.in the sdlc model, changes cannot be made to a system once it is delivered to the user, whereas the xp method delivers the system to the users and then make changes suggested by the user.the sdlc model develops an entire system at once, whereas xp uses incremental steps to improve an information system's qualitydevelopers following the sdlc model cannot go on to the next phase until the current phase is finished, whereas in xp, developers can move to any phase from the current phase.