(2x + 3y)² - (2x - 3y)²- 24xy
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using formula a²-b² = (a+b)(a-b)
(2x+3y)²-(2x-3y)²
(2x+3y+2x-3y)[2x+3y-(2x-3y)]
4x(2x-2x+3y+3y)
4x(6y) => 24xy
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