How do you multiply $(x - 7) (x + 7)$ $(x - 7) (x + 7)$ ?

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Answer 1 · 2015-07-13T17:43:44

$= x^{2} - 49$ $=color(blue)(x^2-49$

$(a - b) (a + b) = a^{2} - b^{2}$ $color(blue)((a-b)(a+b) = a^2-b^2$

The same property can be applied to the expression $(x - 7) (x + 7)$ $(x-7)(x+7)$ where $a = x, b = 7$ $color(blue)(a)=x, color(blue)(b)=7$

So,
$(x - 7) (x + 7) = x^{2} - 7^{2}$ $(x-7)(x+7) = x^2-7^2$

$= x^{2} - 49$ $=color(blue)(x^2-49$

How do you multiply (x - 7) (x + 7)(x−7)(x+7)(x - 7) (x + 7)?