Solve the problem.
-$( 2 x - 9 y ) ^ { 2 }$
A) $4 x ^ { 2 } - 36 x y + 81 y ^ { 2 }$
B) $4 x ^ { 2 } + 81 y ^ { 2 }$
C) $2 x ^ { 2 } + 81 y ^ { 2 }$
D) $2 x ^ { 2 } - 36 x y + 81 y ^ { 2 }$

Question

Quizplus · Accepted Answer

This is solved by applying the formula $(a - b)^2 = a^2 - 2ab + b^2$, where $a = 2x$ and $b = 9y$. Thus, $(2x - 9y)^2 = (2x)^2 - 2*(2x)*(9y) + (9y)^2 = 4x^2 - 36xy + 81y^2$.

Solve the Problem (2x−9y)2( 2 x - 9 y ) ^ { 2 }(2x−9y)2

Solve the Problem $( 2 x - 9 y ) ^ { 2 }$