Posted by Carmen on .
Please explain to me how to do the following problems, I don't understand them. Thanks!
Find the xintercepts (if any) for the graph of the quadratic function.
1.f(x) = (x + 2)2  4
Find the yintercept for the graph of the quadratic function.
5.y + 9 = (x + 3)2
Find the domain and range of the quadratic function whose graph is described.
7.The vertex is (1, 15) and the graph opens up.

Quadratic Functions 
Reiny,
To find the xintercept, set y=0 and solve for x
To find the yintercept, set x=0 and solve for y
the domain of a standard parabola that opens either up or down is
x "is an element of" R
the domain is either y ≥ "the y value of the vertex", if it opens up or
y ≤ "the y value of the vertex" if it opens downwards