26-11-2016
Mathematics

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Show that the expression (x+y)(x-y)-14x+49 may be written as the difference of two squares.

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26-11-2016

for
(a-b)(a+b)=a^2-b^2

x^2-y^2-14x+49
x^2-14x+49-y^2
(x-7)^2-y^2
(x-7-y)(x-7+y)
or
(x-y-7)(x+y-7)

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