Today, students worked on the graphing method to solve the quadratic equations, understanding the relation of quadratic function y=ax^2+bx+c and quadratic equation, ax^2+bx+c=0. First of all, students learned to plot the quadratic functions, mostly using traditional way, connecting some ordered pairs. Then, find the graph x-intercepts which are real solutions of the equation of ax^2+bx+c=0. If there is no intersections of graph and x-axis, it indicates that there are no real solutions in that quadratic equation. Besides the graphing method in solving the quadratic equations, students also reviewed the factorization method to solve the equations. It is clear that factorization method is limited to those that are able to be written in the factor form. The graph method extends to all that have real number solutions, although the results are not accurate due to the error in reading graph.
Here is the homework to cover today’s contents:
workbook 8B
Ch. 14
4. (a) (ii) (iii) (v) (vi); (b) (ii) (iii) (v) (vi), if the equation can be written in factor form, get the solutions to verify the results from the graphs.
13.