Answer
$f(g(k)=320k^2+224k+39$
Work Step by Step
In order to find $f(g(k))$ let's find $g(k)$ first:
$g(k) = 8k+3$
Then subsitute in $f(x)$
$f(g(k))=5(8k+3)^2-2(8k+3)=320k^2+224k+39$
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