Multiply.
-(a - 3)(a + 3)
A) $a ^ { 2 } + 6 a - 9$
B) $a ^ { 2 } - 9$
C) $a ^ { 2 } - 6$
D) $a ^ { 2 } - 6 a - 9$

Name: Multiply. -(a - 3)(a + 3) A) $a ^ { 2 } + 6 a - 9$ B) $a ^ { 2 } - 9$ C) $a ^ { 2 } - 6$ D) $a ^ { 2 } - 6 a - 9$
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Question

Quizplus · Accepted Answer

This is an example of the difference of squares formula, $a^2 - b^2 = (a - b)(a + b)$. Applying it here, $(a - 3)(a + 3) = a^2 - 3^2 = a^2 - 9$.

Multiply -(A - 3)(a + 3) A) a2+6a−9a ^ { 2 } + 6 a - 9a2+6a−9

Multiply
-(A - 3)(a + 3)
A) $a ^ { 2 } + 6 a - 9$