<PRE><B>Question 240697</B>
Graph y=x^2 -2x-8 with a calculator.

{{{graph(300,300,-6,6,-6, 12,x^2-2x-8) }}}


As you can see, the x-intercepts are at x=-2 and x=4.


This can also be determined algebraically by letting y=0 and solving
0=x^2-2x-8
0=(x-4)(x+2)
x=4 or x=-2


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus </PRE>