Question

Which graph represents the function f(x)=2·4^x?

Answer 1

Answer:

A (top left)

Step-by-step explanation:

Assuming that the dot is multiplying the numbers, we get the function:

$f(x) = 8^{x}$

First, lets knock off the obviously wrong answers.

Substitute 0 into the x spot, as anything to the power of zero is one.

$f(0) = 8^{0}=1$

Automatically, the two answers on the right are incorrect, as y is not equal to 1 when x is 0.

Next, lets substitute 1 into the x spot, as anything to the power of one is itself.

$f(1) = 8^{1} = 8$

As a result, the top left graph is correct, as y is equal to 8 when x is 1, unlike the bottom left graph.