Quantitative Aptitude Algebra

By subtracting 7x² - 4xy - 5yx + 4y² from 9y2 - 6xy + 2yx + 8x2 we get:

1

5y2 + x2 + 5xy

2

5y2 + x2 + 9xy

3

5y2 - x2 + 15xy

4

5y2 - x2 + 5xy

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