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X +y =40
Y=(40-x)
Therefore x2 + y2 =x2 +(40-x)2
=X2+40(40-x) –x(40-x)
=X2 +160-40x-40x+x2
=2x2 -80x +160
joseph kieti answered the question on April 12, 2018 at 07:36
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