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a) (5a-3b)² = 25a²-30ab+9b²
b) (2a+5b)² = 4a²+20ab+25b²
j) (-3x+2y)² = 9x²-12xy+4y²
a) 25a²-30ab+9ab = 25a²-21ab
b) 4a²+20ab+25b² = (2a+5b)²
j) 9x²-12xy+4y² = (3x-2y)²