On Wednesday, March 25 2009, Mr. Marsigit explained about graph of quadratic equation. He told us how to design a graph. In drew a graph of quadratic equation, there are elements, the first is graph intersection point with fuse coordinate, second is coordinate top hyperbola point, and the last is equation of symmetry fuse. The value of x or roots that fulfilled quadratic equation depend on the value of discriminate .If D>0, so quadratic equation intersect fuse of x in two different point. If D=0, so quadratic equation intersect fuse of x in one point or tangency fuse of x. And if D<0, so quadratic equation not intersect fuse of x. Quadratic equation and quadratic function was different. Form quadratic equation , but form quadratic functions .
Mr. Marsigit also told us about how make a book. He had made many books. Started from book for junior high school, and now he is preparing a book for senior high school. He is so creative. The first method in made a book was made a curriculum. According to him, philosophy mathematics and junior high school was different. Mathematics spoke about pattern and relation. Mr. Marsigit also explained about Nature of Mathematics. Mathematics consists of:
• Pattern and relation
• Mathematics is a means of problem solving(mathematics should able to applied in living)
• Mathematics is a means of research
The Nature of Mathematics is tools for communication. With mathematics, we could communicate with human.