Express 25x²-70xy+49y² as a perfect square
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Answer:
(5x-7y)²
Step-by-step explanation:
25x²-70xy+49y² [we can use either middle term formula or an algebraic expression]
(a - b)² = a²-2ab+b²
a² = 25x² , a = ±5x
b² = 49y² , b = ±7y
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