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Answer» -STEP EXPLANATION:a) (3X-y)²formula: (a-b)²=a²-2ab+b²sol: (3x-y)²= (3x)²+2(3x)(-y)+(-y)² = 9x² -6XY +y²b) (X+y)²formula: (a+b)²=a²+2ab+b²Sol: (x+y)²=(x)²+2(x)(y) + (y)² = x²+2xy+y² |
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