Find the sum or difference.
-$$( 2 x + 9 y ) ^ { 2 }$$
A) $2 x ^ { 2 } + 81 y ^ { 2 }$
B) $4 x ^ { 2 } + 36 x y + 81 y ^ { 2 }$
C) $4 x ^ { 2 } + 81 y ^ { 2 }$
D) $2 x ^ { 2 } + 36 x y + 81 y ^ { 2 }$

Question

Quizplus · Accepted Answer

The expression $(2x + 9y)^2$ is expanded using the formula $(a + b)^2 = a^2 + 2ab + b^2$, resulting in $4x^2 + 36xy + 81y^2$.

Find the Sum or Difference (2x+9y)2( 2 x + 9 y ) ^ { 2 }(2x+9y)2

Find the Sum or Difference $( 2 x + 9 y ) ^ { 2 }$