Question

The function f(x) = (a^x) + 4 will never cross the x -axis?.
True or false.

Answer 1

f(x) would cross the x -axis, if f(x) = 0, in other words :
(a^x) + 4 = 0
is there solution for x ?

Answer 2

It would be true, because it has a restriction b^x can't equal 0
Plus in this example the graph is shifted up 4 units, the new restriction would be at 4.

Answer 3

crap. I just broke into pieces.

Answer 4

Here sham, go to about the middle of the page in the blue:
http://tutorial.math.lamar.edu/Classes/Alg/ExpFunctions.aspx

Answer 5

thank you all.