If , find the range of the function…

MATHEMATICS · Subjective · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

If f(x)=π(x+7−4x−9)f(x)=\pi\left(\frac{\sqrt{x+7}-4}{x-9}\right), find the range of the function y=ln⁡(2f(x))y=\ln(2f(x)).

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