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How do you multiply #(x-15y)(x+15y)#?

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1 Answer

Apr 6, 2015

#x^2-225y^2#
This is a difference of squares where:
#(a^2-b^2) = (a+b)(a-b)#

If we let #a=x# and #b=15y#
#((x)^2-(15y)^2) = (x+15y)(x-15y)#

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