General

Domain: (-Infinity, Infinity)
Range: (-Infinity,1) U [2,Infinity)

Lol graph? Graphing on basilmarket is hard.

[quote=CallToArms]Just plug in the numbers and evaluate (make sure you put it in to the right one)
For a), f(-1) goes in the top because x<0, so 2(-1)+1=-1

After you do a-d, graph (if you need to to find the domain/range) and find the domain and range.

Hint: For 25 D, the range of t²+1 is R={lR | t >= 1}, so it only has to get plugged in to the bottom portion of the eqn.[/quote]

a: -1
b: 2
c: 6
d: How do I get d?

And then how do I graph all this?

[quote=wordk41]I'm quite confused, what do I do?
A friend has told me that a, b, c, and d could be multiple choice answers.[/quote]

This is actually not very hard once you understand it.

Look at both lines in the swirly bracket, then go to (a). It says "f(-1)" so you're going to plug -1 in for x where it says "x<0."

If it was f(2) youd use the bottome one

I'm quite confused, what do I do?
A friend has told me that a, b, c, and d could be multiple choice answers.

If the value is less than zero, use the top equation. If it is greater than or equal to 0, use the bottom one.

If I remember correctly, plug in the numbers. Those will give you the endpoints of the graph. Graph it, and determine the domain and range.