Solve the problem.
-$$( 7 a + 3 c ) ( 7 a - 3 c )$$
A) $7 a ^ { 2 } - 3 c ^ { 2 }$
B) $49 a ^ { 2 } - 42 a c - 9 c ^ { 2 }$
C) $49 a ^ { 2 } + 42 a c - 9 c ^ { 2 }$
D) $49 a ^ { 2 } - 9 c ^ { 2 }$

Question

Quizplus · Accepted Answer

This problem uses the difference of squares formula, $a^2 - b^2 = (a + b)(a - b)$. Here, $a = 7a$ and $b = 3c$, so the solution is $49a^2 - 9c^2$.

Solve the Problem (7a+3c)(7a−3c)( 7 a + 3 c ) ( 7 a - 3 c )(7a+3c)(7a−3c)

Solve the Problem $( 7 a + 3 c ) ( 7 a - 3 c )$