IfA=7x2+5xy-9y2,B=-4x2+xy+5y2 and C=4y2-3x2-6xy then show that A+B+C=0
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7 × 2 + 5xy - 9y2 - 4 × 2 + xy + 5y2 + 4y2 - 3 × 2 - 6xy
=) 14 + 5xy - 18y - 8 + xy + 10y + 8y - 6 - 6xy
=) 14 - 8 - 6 + 5xy + xy - 6xy - 18y + 10y + 8y
=) 0 + 0 + 0
=) 0
Hence, A + B + C = 0
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=) 14 + 5xy - 18y - 8 + xy + 10y + 8y - 6 - 6xy
=) 14 - 8 - 6 + 5xy + xy - 6xy - 18y + 10y + 8y
=) 0 + 0 + 0
=) 0
Hence, A + B + C = 0
If this answer helps you then please mark it as brainliest.
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