here is a math movie tutorial about quadratic equations. it was done as an impress presentation working with some no cost movie-display screen-seize program. also, utilized the headset – for all those who like it -) for all those who come across it also noisy, sorry :-/ it was what was least complicated.
thanks all people for all of your help, sorry I do not have time to respond to each individual remark… but I do respect them! you men can really cheer me up when factors are not good!