If A = 7x² + 5xy - 9y²,B = - 4x² + xy + 5y² and C = 4y² - 3x² - 6xy then show that
A+B+C =0
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If A=7x²+5xy -9y²,B = 4x²+xy + 5y² and C = 4y²-3x²- 6xy then show that A+B+C =O. - 11067851.
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