View Full Version : Points of intersection of functions
hjacks6
Nov 26, 2010, 10:52 PM
Find the points of intersection of the following functions
y = (x+1)^2 and y = - x^2 + x + 4
If possible can you also show how to check results on graphics calculator. Thanks
Unknown008
Nov 27, 2010, 12:41 AM
I don't know how to use a graphics calculator, but you can solve this by using simultaneous equations and plugging the values you got back in the original equations to see if they are good.
y = (x+1)^2
y = -x^2 + x + 4
This becomes:
(x+1)^2 = -x^2 + x + 4
Expand and solve the quadratic. Post what you get! :)
galactus
Nov 27, 2010, 02:42 AM
If you have a graphing calculator, all you have to do is graph the two given functions and see where they intersect.
As you can see, there are 2 POI.