=x2 /4 + xy -3y2
=1/4{x2 + 4xy -12y2}
=1/4{x2 + 6xy -2xy -12y2}​​​​​​​
=1/4{x(x+6y) -2y(x +6y)​​​​​​​}
=1/4{(x+6y)(x -2y)​​​​}
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