It seems that $ x^{2}+x+120 $ cannot be factored out.
Step 1: Identify constants $ \color{blue}{ b }$ and $\color{red}{ c }$. ( $ \color{blue}{ b }$ is a number in front of the $ x $ term and $ \color{red}{ c } $ is a constant). In our case:
$$ \color{blue}{ b = 1 } ~ \text{ and } ~ \color{red}{ c = 120 }$$Now we must discover two numbers that sum up to $ \color{blue}{ 1 } $ and multiply to $ \color{red}{ 120 } $.
Step 2: Find out pairs of numbers with a product of $\color{red}{ c = 120 }$.
PRODUCT = 120 | |
1 120 | -1 -120 |
2 60 | -2 -60 |
3 40 | -3 -40 |
4 30 | -4 -30 |
5 24 | -5 -24 |
6 20 | -6 -20 |
8 15 | -8 -15 |
10 12 | -10 -12 |
Step 3: Because none of these pairs will give us a sum of $ \color{blue}{ 1 }$, we conclude the polynomial cannot be factored.