Solve the problem.
-$( a - 9 ) ( a + 9 )$
A) $a ^ { 2 } - 18 a - 81$
B) $a ^ { 2 } - 18$
C) $a ^ { 2 } - 81$
D) $a ^ { 2 } + 18 a - 81$

Name: Solve the problem. -$( a - 9 ) ( a + 9 )$ A) $a ^ { 2 } - 18 a - 81$ B) $a ^ { 2 } - 18$ C) $a ^ { 2 } - 81$ D) $a ^ { 2 } + 18 a - 81$
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Question

Quizplus · Accepted Answer

This problem uses the difference of squares formula, which is $a^2 - b^2 = (a - b)(a + b)$. Applying this formula with $a$ and $9$, we get $a^2 - 9^2 = a^2 - 81$.

Solve the Problem (a−9)(a+9)( a - 9 ) ( a + 9 )(a−9)(a+9)

Solve the Problem $( a - 9 ) ( a + 9 )$