Multiply.
-$( a - 10 ) ( a + 10 )$
A) $a ^ { 2 } + 20 a - 100$
B) $a ^ { 2 } - 20$
C) $a ^ { 2 } - 100$
D) $a ^ { 2 } - 20 a - 100$

Name: Multiply. -$( a - 10 ) ( a + 10 )$ A) $a ^ { 2 } + 20 a - 100$ B) $a ^ { 2 } - 20$ C) $a ^ { 2 } - 100$ D) $a ^ { 2 } - 20 a - 100$
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Question

Quizplus · Accepted Answer

This is an application of the difference of squares formula, $a^2 - b^2 = (a - b)(a + b)$, where $a = a$ and $b = 10$, resulting in $a^2 - 10^2 = a^2 - 100$.

Multiply - (a−10)(a+10)( a - 10 ) ( a + 10 )(a−10)(a+10)

Multiply
- $( a - 10 ) ( a + 10 )$