Solve the problem.
-$$( 6 x - 5 y + 7 ) ( 6 x - 5 y - 7 )$$
A) $36 x ^ { 2 } - 60 x y + 25 y ^ { 2 } - 49$
B) $- 60 x y - 42 x + - 35 y - 49$
C) $12 x ^ { 2 } - 10 y ^ { 2 } - 98$
D) $36 x ^ { 2 } + 60 x y - 25 y ^ { 2 } - 98$

Question

Quizplus · Accepted Answer

This problem uses the difference of squares formula, $a^2 - b^2 = (a + b)(a - b)$, where $a = 6x - 5y$ and $b = 7$. Squaring $a$ gives $36x^2 - 60xy + 25y^2$, and squaring $b$ gives $49$. The correct expression is $36x^2 - 60xy + 25y^2 - 49$.

Solve the Problem (6x−5y+7)(6x−5y−7)( 6 x - 5 y + 7 ) ( 6 x - 5 y - 7 )(6x−5y+7)(6x−5y−7)

Solve the Problem $( 6 x - 5 y + 7 ) ( 6 x - 5 y - 7 )$