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# Algebra help please

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Which graph represents the exponential function𝑓(𝑥) = 2(2)x-4 ?    Dec 1, 2017

#2
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Maybe it is supposed to be

f(x)  =  2(2)x - 4        ???

If so...

f(0)   =   2(2)0 - 4   =   2(1) - 4   =   2 - 4   =   -2     So the graph passes through  (0, -2) .

f(1)   =   2(2)1 - 4   =   2(2) - 4   =   4 - 4   =   0     So the graph passes through  (1, 0) .

The first graph passes through  (0, -2)  and  (1, 0)  , so it looks right.

Here's a graph of  y = 2(2)x - 4

Dec 1, 2017

#1
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None of them

Here is the graph  :  https://www.desmos.com/calculator/6t93qupx9m

Are you sure that you have the correct function ???   Dec 1, 2017
#2
+1

Maybe it is supposed to be

f(x)  =  2(2)x - 4        ???

If so...

f(0)   =   2(2)0 - 4   =   2(1) - 4   =   2 - 4   =   -2     So the graph passes through  (0, -2) .

f(1)   =   2(2)1 - 4   =   2(2) - 4   =   4 - 4   =   0     So the graph passes through  (1, 0) .

The first graph passes through  (0, -2)  and  (1, 0)  , so it looks right.

Here's a graph of  y = 2(2)x - 4

hectictar Dec 1, 2017
#3
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Nice detective work, hectictar.....!!!!   Dec 1, 2017