Math, asked by luciexforstudy2961, 8 months ago

If P = 7x 2 + 5xy − 9y 2 , Q = 4y 2 − 3x 2 − 6xy and R = −4x 2 + xy + 5y 2 , show that P + Q + R =

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Answered by harshitsinha15

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