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How to factor  985xy +350x^2 +660y^2 by grouping?

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985xy +350x^2 +660y^2=\\ 350x^2+985xy+66y^2=\\ 5(70x^2+197xy+132y^2)=\\ 5(70x^2+120xy+77xy+132y^2)=\\ 5(10x(7x+12y)+11y(7x+12y))=\\ 5(10x+11y)(7x+12y)
User Eugene Zhulenev
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