How do you multiply $(5x - 5)(5x + 5)$ ?

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Answer 1 · 2015-07-25T14:30:34

$=color(blue)(25x^2 -25$

$color(blue)((5x−5))(5x+5)$

The expression is of the form
$color(blue)((a-b)(a+b) = a^2-b^2$

Here $a=5x , b=5$

So,
$(5x)^2 - (5)^2=color(blue)(25x^2 -25$

How do you multiply (5x - 5)(5x + 5)(5x - 5)(5x + 5)?