text: ## Elementary Technical Mathematics
  
  $(x+4)(x+15)$
  $x^2+19x+60$ has no common monomial factors. =$(\ \ \ \ \ \ \ \ \ )(\ \ \ \ \ \ \ \ \ )$ =$(x\ \ \ \ \ \ \ )(x\ \ \ \ \ \ \ )$ =$(x+\ \ )(x+\ \ )$ All the terms in the trinomial are positive. =$(x+4)(x+15)$ 4 and 15 have a sum of 19 and a product of 60.
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