Factor polynomial $$ 27m^{3}-126m^{2}+147m $$

$$ 27m^{3}-126m^{2}+147m = 3m( 3m-7 )^{ 2 } $$

Step 1 :

After factoring out $ 3m $ we have:

$$ 27m^{3}-126m^{2}+147m = 3m ( 9m^{2}-42m+49 ) $$

Step 2 :

Both the first and third terms are perfect squares.

$$ 9x^2 = \left( \color{blue}{ 3m } \right)^2 ~~ \text{and} ~~ 49 = \left( \color{red}{ 7 } \right)^2 $$

The middle term ( $ -42x $ ) is two times the product of the terms that are squared.

$$ -42x = - 2 \cdot \color{blue}{3m} \cdot \color{red}{7} $$

We can conclude that the polynomial $ 9m^{2}-42m+49 $ is a perfect square trinomial, so we will use the formula below.

$$ A^2 - 2AB + B^2 = (A - B)^2 $$

In this example we have $ \color{blue}{ A = 3m } $ and $ \color{red}{ B = 7 } $ so,

$$ 9m^{2}-42m+49 = ( \color{blue}{ 3m } - \color{red}{ 7 } )^2 $$

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