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How do you factorize these two questions: #X - y - x ^2+ y^2# and #x^3 - 36 x#?

1 Answer

Mar 19, 2015

Watch the plusses and minuses!

#x-y-x^2+y^2#
#=x-y-(x^2-y^2)#
#=(x-y)-(x+y)(x-y)#
#=(1-x-y)(x-y)#

#x^3-36x#
#=x(x^2-36)#
#=x(x-6)(x+6)#

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