Multiply mentally.
-$(-1+11 \mathrm{x})(1+11 \mathrm{x})$
A) $121 x^{2}-22 x-1$
B) $121 x^{2}-1$
C) $121 x^{2}+22 x-1$
D) $x^{2}-1$

Name: Multiply mentally. -$(-1+11 \mathrm{x})(1+11 \mathrm{x})$ A) $121 x^{2}-22 x-1$ B) $121 x^{2}-1$ C) $121 x^{2}+22 x-1$ D) $x^{2}-1$
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Question

Quizplus · Accepted Answer

This is a product of the form $(a+b)(a-b)$, which equals $a^2 - b^2$. Here, $a = 11x$ and $b = 1$, so the product is $(11x)^2 - 1^2 = 121x^2 - 1$.

Multiply Mentally (−1+11x)(1+11x)(-1+11 \mathrm{x})(1+11 \mathrm{x})(−1+11x)(1+11x) A) 121x2−22x−1121 x^{2}-22 x-1121x2−22x−1 B) 121x2−1121 x^{2}-1121x2−1 C) 121x2+22x−1121 x^{2}+22 x-1121x2+22x−1

Multiply Mentally $(-1+11 \mathrm{x})(1+11 \mathrm{x})$ A) $121 x^{2}-22 x-1$ B) $121 x^{2}-1$ C) $121 x^{2}+22 x-1$