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If the logarithmic parent function, f(x) = log₂(x), is vertically stretched by a factor of 8, reflected across the x-axis, and then translated left 2 units, what is the resulting function?

a) f(x) = -8 * log₂(x - 2)
b) f(x) = -log₂(8x - 2)
c) f(x) = 8 * log₂(x + 2)
d) f(x) = -log₂(8x + 2)

1 Answer

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Final answer:

The correct transformation of the logarithmic parent function is f(x) = -8 * log₂(x + 2), after it is vertically stretched by a factor of 8, reflected across the x-axis, and translated left 2 units. The resulting function is option (a).

Step-by-step explanation:

If the logarithmic parent function, f(x) = log₂(x), undergoes a series of transformations, starting with a vertical stretch by a factor of 8, followed by a reflection across the x-axis, and ending with a translation 2 units to the left, the resulting function will incorporate these changes step by step.

To vertically stretch the function by a factor of 8, we simply multiply the original function by 8:

f(x) = 8 ∙ log₂(x).

Next, reflecting it across the x-axis involves multiplying the function by -1:

f(x) = -1 ∙ 8 ∙ log₂(x) or f(x) = -8 ∙ log₂(x).

Lastly, translating it left by 2 units means we substitute x in the function with (x+2):

f(x) = -8 ∙ log₂(x+2).

Therefore, the correct transformation of the given logarithmic parent function is f(x) = -8 ∙ log₂(x+2), which matches option (a).

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