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16( x + y )^2 - 25( x - 3y )^2
16( x^2 + 2xy + y^2 ) - 25( x^2 - 6xy + 9y^2)
16x^2 + 32xy + 16y^2 - 25x^2 + 150xy - 225y^2
-9x^2 + 182xy - 209y^2
16( x^2 + 2xy + y^2 ) - 25( x^2 - 6xy + 9y^2)
16x^2 + 32xy + 16y^2 - 25x^2 + 150xy - 225y^2
-9x^2 + 182xy - 209y^2
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