Factor polynomial $$ 9y^{2}-30y+25 $$
Answer
$$ 9y^{2}-30y+25 = ( 3y-5 )^{ 2 } $$
Explanation
Both the first and third terms are perfect squares.
$$ 9x^2 = \left( \color{blue}{ 3y } \right)^2 ~~ \text{and} ~~ 25 = \left( \color{red}{ 5 } \right)^2 $$The middle term ( $ -30x $ ) is two times the product of the terms that are squared.
$$ -30x = - 2 \cdot \color{blue}{3y} \cdot \color{red}{5} $$We can conclude that the polynomial $ 9y^{2}-30y+25 $ 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 = 3y } $ and $ \color{red}{ B = 5 } $ so,
$$ 9y^{2}-30y+25 = ( \color{blue}{ 3y } - \color{red}{ 5 } )^2 $$This page was created using
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