Question

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

Answer 1

Answer:

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Answer 2

$\huge{\colorbox{pink}{\color{red}{Question:}}}$

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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$\huge{\colorbox{yellow}{\color{green}{Answer:}}}$

A = 7x² +5xy -9y²

B = 4x² +xy + 5y²

C = 4y² -3x² - 6xy

$\bold{ (7x² +5xy -9y²) + (4x² +xy + 5y²) + (4y² -3x² - 6xy) }$

$\bold{ = 7x² + 5xy -9y² - 4x² + xy + 5y² - 4y² -3x² - 6xy }$

$\bf{ = (7 - 4 - 3)x² + (5 + 1 - 6)xy + (-9 + 5 - 4)y² }$

$\bf{ = (0)x² + (0)xy + (0)y² }$

$\bf{ = 0}$

$\large\purple{\sf{Hence~proved!}}$

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