factor of 25x sq.+16y sq. +40xy
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25x^2+16y^2+40xy
(5x)^2+(4y)^2+2(5x)(4y)
according to a^2+b^2+2ab=(a+b)^2
(5x+4y)^2
(5x)^2+(4y)^2+2(5x)(4y)
according to a^2+b^2+2ab=(a+b)^2
(5x+4y)^2
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