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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I need point sarthak gaur
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Step-by-step explanation:
=7x²+5xy-9y²+(-4x²+xy+5y²)+4y²-3x²-6xy
=7x²+5xy-9y²-4x²+xy+5y²+4y²-3x²-6xy
=7x²-4x²-3x²-9y²+5y²+4y²+5xy+xy-6xy
=0
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