Intercept Form
of quadratic function
The quadratic equation is written in "standard form"
Vertex and intercept forms of a quadratic function
For both forms, the graph opens up if and opens down if
Ex 1) Graph y = ­(x + 2)(x ­ 4)
You can change quadratic functions from intercept form or vertex form to standard form by using the FOIL method.
Ex 2) write the quadratic function in standard form.
a. y = ­ (x + 4)(x ­ 9) b. Assignment page 253, numbers 32 ­ 37, 38 ­ 48 even
Title: Nov 13­2:10 PM (1 of 1)