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:
$$ \color{blue}{ b = -1 } ~ \text{ and } ~ \color{red}{ c = -6 }$$Now we must discover two numbers that sum up to $ \color{blue}{ -1 } $ and multiply to $ \color{red}{ -6 } $.
Step 2: Find out pairs of numbers with a product of $\color{red}{ c = -6 }$.
PRODUCT = -6 | |
-1 6 | 1 -6 |
-2 3 | 2 -3 |
Step 3: Find out which pair sums up to $\color{blue}{ b = -1 }$
PRODUCT = -6 and SUM = -1 | |
-1 6 | 1 -6 |
-2 3 | 2 -3 |
Step 4: Put 2 and -3 into placeholders to get factored form.
$$ \begin{aligned} w^{2}-w-6 & = (x + \color{orangered}{\square} )(x + \color{orangered}{\square}) \\ w^{2}-w-6 & = (x + 2)(x -3) \end{aligned} $$