Saturday, November 16, 2013

The graph is a parabola with vertex (3,-8) and passing through the origin. Write the quadratic equation of this graph.

We use the Standard Form: 
%0D%0Ay=a%2A%28x-h%29%5E2%2Bk%0D%0A
from the vertex we get:
%0D%0Ay=a%2A%28x-3%29%5E2-8%0D%0A 
since the origin is on the graph, 
%0D%0A0=a%2A%280-3%29%5E2-8%0D%0A 

9a=8 
a=9%2F8 

so we can write
%0D%0Ay=%289%2F8%29%2A%28x-3%29%5E2-8%0D%0A
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)