2x-3y =9 .Find the value of 4x2+9y2
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➟ 2x - 3y = 9
• Squaring Both Side
➟ (2x - 3y)² = (9)²
➟ (2x)² + (3y)² - 2 × 2x × 3y = 9 × 9
➟ 4x² + 9y² - 12xy = 81
➟ 4x² + 9y² = 81 + 12xy
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