## Introductory Algebra for College Students (7th Edition)

The given expression, $x^2+4x+12 ,$ has $c= 12$ and $b= 4 .$ The possible factors of $c$ are $\{ 1,12 \} ,\{ 2,6 \} ,\{ 3,4 \} \{ -1,-12 \} ,\{ -2,-6 \} ,\{ -3,-4 \}$. None of these factors give a sum equal to $b$. Hence, the given expression is $\text{ not factorable .}$