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Question

Subtract 5x²- 4y²+6y-3 from 7x²-4xy+8y²+5x-3y

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Solution

r = 5x² - 4y² + 6y - 3

and

r' = 7x² - 4xy + 8y² + 5x - 3y

Now,

r' - r

= (7x² - 4xy + 8y² + 5x - 3y) - (5x² - 4y² + 6y - 3)

= 2x² - 4xy + 12y² + 5x - 9y + 3

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