Question

${x}^{2} - {y}^{2} - 6y2 - 9 {x}^{2}$
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Answer 1

Step-by-step explanation:

→ x² - y² - 6y² - 9x²

→ ( - 9x² + x² ) - 6y² - y²

→ 8x² - 7y²

Use formula :-

→ ( a - b )² = a² - 2ab + b²

→ ( 8x - 7y )² = (8x)² - 2*8x*7y + (7y)²

• 64x² - 112xy + 49y²

Answer 2

$x ^{2} - y ^{2} - 6y ^{2} - 9x ^{2} \\ x ^{2} + - 9x ^{2} - y ^{2} - 6y ^{2} \\ - 8x ^{2} - 7y ^{2} \\ - 15x ^{2} y ^{2}$

$hope \: it \: helps.$