2) If 25x² - 40xy +16y²= A² Find A ?
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110x-40xy+32y=A2
110x-72xy=A2
38xy=A2
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Answer:
=> 25x²- 40xy + 16y² = A²
=> (5x)²-2×(5x)×(4y)+(4y)² = A²
=> (5x-4y)² = A²
so, A = (5x-4y)
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