Factor polynomial $$ 49x^{2}+210x+225 $$
Answer
$$ 49x^{2}+210x+225 = ( 7x+15 )^{ 2 } $$
Explanation
Both the first and third terms are perfect squares.
$$ 49x^2 = \left( \color{blue}{ 7x } \right)^2 ~~ \text{and} ~~ 225 = \left( \color{red}{ 15 } \right)^2 $$The middle term ( $ 210x $ ) is two times the product of the terms that are squared.
$$ 210x = 2 \cdot \color{blue}{7x} \cdot \color{red}{15} $$We can conclude that the polynomial $ 49x^{2}+210x+225 $ 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 = 7x } $ and $ \color{red}{ B = 15 } $ so,
$$ 49x^{2}+210x+225 = ( \color{blue}{ 7x } + \color{red}{ 15 } )^2 $$This page was created using
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