3

Set 6: Exponential Functions (Advanced)

Explanation

Answer: A

The function f(x)=8(2)xf(x) = 8(2)^x is transformed to g(x)=8(2)x3g(x) = 8(2)^{x-3}. How does the graph shift?

A.

3 units right

✓ Correct
B.

3 units left

C.

3 units up

D.

3 units down

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Identify the horizontal shift. 1. Form: y=a(b)xhy = a(b)^{x-h} shifts right by hh units. 2. Given: g(x)=8(2)x3g(x) = 8(2)^{x-3}, so h=3h = 3. 3. Shift: Graph moves 3 units to the right. Strategic Tip: (xh)(x - h) shifts right, (x+h)(x + h) shifts left. Choice B is incorrect because (x3)(x - 3) means right, not left. Choice C is incorrect because this would require adding a constant outside. Choice D is incorrect because vertical shifts involve adding/subtracting from the entire function.

Key Steps:

The correct answer is 3 units right

Why others are wrong:
B: Choice B is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.

🎯 Keep Practicing!

Master all sections for your best SAT score