Multiply.
-(13 - 3r)(13 + 3r)
A) $169 - 3 r ^ { 2 }$
B)169 $169 - 78 r - 9 r ^ { 2 }$
C)169 $169 + 78 r - 9 r ^ { 2 }$
D) $169 - 9 r ^ { 2 }$

Question

Quizplus · Accepted Answer

This is a product of two binomials that form a difference of squares. The formula for the difference of squares is $a^2 - b^2 = (a - b)(a + b)$. Applying this formula, where $a = 13$ and $b = 3r$, we get $13^2 - (3r)^2 = 169 - 9r^2$.

Multiply -(13 - 3r)(13 + 3r) A) 169−3r2169 - 3 r ^ { 2 }169−3r2

Multiply
-(13 - 3r)(13 + 3r)
A) $169 - 3 r ^ { 2 }$