#1**+2 **

Since the first value we're given is, - 4 we want to look for the correct function to plug this into

Notice that the last function is only good when x > 1......so that's not the one we want

The second function is only good when x > -4 [and ≤ 1 ] so....we don't want that one, either

So....the first one says it's good when x is less than or equal to - 4.....so that's the one we want

So ....puting -4 into x^2 we get (-4) = 16

Then...we want to choose the correct function when x = 4

This is obviously the last one since it's good when x > 1

So...plugging 4 into √ x....we get √ 4 = 2

CPhill
Sep 27, 2017