Answer:
A
Explanation:
When you plug in each of the x, you get the right output.
2 x (4^1)= 8
2 x (4^2) = 2 x 16 =32
2 x (4^3)= 2 x 64= 128
2 x (4^4)= 2 x 256= 512
you multiply the previous term by 4 each time, so the base is 4.
That leaves A and B remaining.
If we substitute x = 1 into the two answers, A gives you 8 like in the problem while B gives you 4.
So the answer must be A
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