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

1 Answer

Jul 25, 2015

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

Explanation:

#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#

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