Multiply.
-$(7 y+x)(7 y-x)$
A) $49 y^{2}+14 x y-x^{2}$
B) $49 y^{2}-x^{2}$
C) $14 y^{2}-x^{2}$
D) $49 y^{2}-14 x y-x^{2}$
E) $16 a^{2}+88 a c-121 c^{2}$

Name: Multiply. -$(7 y+x)(7 y-x)$ A) $49 y^{2}+14 x y-x^{2}$ B) $49 y^{2}-x^{2}$ C) $14 y^{2}-x^{2}$ D) $49 y^{2}-14 x y-x^{2}$ E) $16 a^{2}+88 a c-121 c^{2}$
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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 $a = 7y$ and $b = x$, resulting in $49y^2 - x^2$.

Multiply - (7y+x)(7y−x)(7 y+x)(7 y-x)(7y+x)(7y−x) A) 49y2+14xy−x249 y^{2}+14 x y-x^{2}49y2+14xy−x2 B) 49y2−x249 y^{2}-x^{2}49y2−x2

Multiply
- $(7 y+x)(7 y-x)$ A) $49 y^{2}+14 x y-x^{2}$ B) $49 y^{2}-x^{2}$