y-intercept of a line Archives - Math and Multimedia

The Multiplication Parabola

July 25, 2011 GB High School Algebra, High School Mathematics

In the graph below, move points $A$ and $B$ such that they are on opposite sides of the y-axis. What do you observe?

[iframe http://mathandmultimedia.com/wp-content/geogebraapplets/multiplicationinparabola/parabolamultiplication.html 500 400]

Theorem: Given two points on the function $f(x) = x^2$ , whose coordinates are $(a,a^2)$ and $(b, b^2)$ with $a < 0$ and $b > 0$ , the y-intercept of the line passing through these points is $-ab$ . » Read more

One comment equation of a line, quadratic function, slope of a line, y-intercept of a line