(3x +2y)² - 3(2x-5y)² = [(3x+2y)(3x+2y)] - [3(2x-5y) (2x-5y) = [9x² + 6xy + 6xy + 4y²] - [3(4x² -10xy -10xy +25y²)] = [9x²+12xy+4y²] - [3(4x²-20xy+25)] = 9x² +12xy +4y² -12x² +60xy-75 y² = -3x² + 72xy - 71y²
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(3x +2y)² - 3(2x-5y)² = [(3x+2y)(3x+2y)] - [3(2x-5y) (2x-5y) = [9x² + 6xy + 6xy + 4y²] - [3(4x² -10xy -10xy +25y²)] = [9x²+12xy+4y²] - [3(4x²-20xy+25)] = 9x² +12xy +4y² -12x² +60xy-75 y² = -3x² + 72xy - 71y²
maaf kalo salah hehe