if x:y=2:5 find (3x square - 2xy + 5y square):( x square + 7xy - 2y square)
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Sum of 3x² + 2xy - 2y² and 5y2 - 7xy
= 3x² + 2xy - 2y² + 5y² - 7xy
= 3x² - 5xy + 3y²
Now
5x² + 2y² - 3xy
3x² + 3y² - 5xy
- - +
2x² - y² + 2xy
= 2x² + -2xy-y²
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