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How do you multiply #(k + 3)(k – 3)#?

1 Answer

Apr 6, 2015

#k^2-9#
This is a difference of squares where:
#(x^2-y^2) = (x+y)(x-y)#

If we let #x=k# and #y=3#
#((k)^2-(3)^2) = (k+3)(k-3)#

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