Factor.
-$25 x ^ { 2 } + 90 x y + 81 y ^ { 2 }$
A) $( 5 x + 9 y ) ( 5 x - 9 y )$
B) $( 5 x - 9 y ) ^ { 2 }$
C) $( 5 x + 9 y ) ^ { 2 }$
D) $( 25 x + y ) ( x + 81 y )$

Question

Quizplus · Accepted Answer

This expression is a perfect square trinomial, factoring into $(5x + 9y)^2$, because $25x^2$ is the square of $5x$, $81y^2$ is the square of $9y$, and $90xy$ is twice the product of $5x$ and $9y$.

Factor - 25x2+90xy+81y225 x ^ { 2 } + 90 x y + 81 y ^ { 2 }25x2+90xy+81y2

Factor
- $25 x ^ { 2 } + 90 x y + 81 y ^ { 2 }$