TMUA 2020 Paper 1 Q6 — Worked Solution

P1·Indices, Logarithms & Exponentials, Functions, Transformations & Graphs·5.5Official · 2020 · Q6

hidden-quadraticcompleting-the-squaremaximum-of-reciprocal

Find the maximum value of the function

f (x) = \frac{1}{5 ^{2 x} - 4 ( 5 ^{x} ) + 7} .

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