(3x – 2y) (3x + 2y) (9x2²+ 4y²).
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(3x-2y)(3x+2y)(9x²+4y²)
(3x)²-(2y)²(9x²+4y²)
(9x²-4y²)(9x²+4y²)
(9x²)²-(4y²)²
81x⁴-16y⁴
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Answer:
(3x)²- (2y)² }( 9x² + 4y²) = (9x² - 4y²)(9x² +4y²) =
⇒(9x²)² - (4y²)² = 81x⁴ - 16y⁴
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