Factor polynomial $$ x^{3}+4x^{2}+3x $$

$$ x^{3}+4x^{2}+3x = x( x+1 )( x+3 ) $$

Step 1 :

After factoring out $ x $ we have:

$$ x^{3}+4x^{2}+3x = x ( x^{2}+4x+3 ) $$

Step 2 :

Step 2: 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:

$$ \color{blue}{ b = 4 } ~ \text{ and } ~ \color{red}{ c = 3 }$$

Now we must discover two numbers that sum up to $ \color{blue}{ 4 } $ and multiply to $ \color{red}{ 3 } $.

Step 3: Find out pairs of numbers with a product of $\color{red}{ c = 3 }$.

PRODUCT = 3
1     3	-1     -3

Step 4: Find out which pair sums up to $\color{blue}{ b = 4 }$

PRODUCT = 3 and SUM = 4
1     3	-1     -3

Step 5: Put 1 and 3 into placeholders to get factored form.

$$ \begin{aligned} x^{2}+4x+3 & = (x + \color{orangered}{\square} )(x + \color{orangered}{\square}) \\ x^{2}+4x+3 & = (x + 1)(x + 3) \end{aligned} $$

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