Answer
$25x^{2}-80x+64$
Work Step by Step
Not to be confused with $(g\circ g)(x)$, this function is the product of g(x) with g(x),
$gg(x)=g(x)\cdot g(x)=(5x-8)(5x-8)=(5x-8)^{2}$
or
$25x^{2}-80x+64$
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