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प्रश्न
Subtract: 4x2 - 5x2y + y2 from - 3y2 + 5xy2 - 7x2 - 9x2y
उत्तर
4x2 - 5x2y + y2 from - 3y2 + 5xy2 - 7x2 - 9x2y
= (- 3y2 + 5xy2 - 7x2 - 9x2y) - (4x2 - 5x2y + y2)
= - 3y2 + 5xy2 - 7x2 - 9x2y - 4x2 + 5x2y - y2
= - 3y2 - y2 + 5xy2 - 7x2 - 4x2 - 9x2y + 5x2y
= - 4y2 + 5xy2 - 11x2 - 4x2y
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