Answer
$(3x+1)(x+5)$
Work Step by Step
Rewrite 16x as 15x + 1x
$3x^{2} + 16x + 5 = 3x^{2} + 15x + 1x +5$
Factor out GCF of each pair of terms, which would be
$3x(x+5) + 1(x+5)$
Now use distributive property =
$(3x+1)(x+5)$
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