Multiply.
-$( 7 x - 9 ) ^ { 2 }$
A) $7 x ^ { 2 } - 126 x + 81$
B) $49 x ^ { 2 } + 81$
C) $7 x ^ { 2 } + 81$
D) $49 x ^ { 2 } - 126 x + 81$

Name: Multiply. -$( 7 x - 9 ) ^ { 2 }$ A) $7 x ^ { 2 } - 126 x + 81$ B) $49 x ^ { 2 } + 81$ C) $7 x ^ { 2 } + 81$ D) $49 x ^ { 2 } - 126 x + 81$
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Question

Quizplus · Accepted Answer

When you square the expression $(7x - 9)^2$, you apply the formula $(a - b)^2 = a^2 - 2ab + b^2$, where $a = 7x$ and $b = 9$. Squaring each and applying the formula gives $49x^2 - 126x + 81$.

Multiply - (7x−9)2( 7 x - 9 ) ^ { 2 }(7x−9)2

Multiply
- $( 7 x - 9 ) ^ { 2 }$