4x²⁺25y²⁺20xy-10x-25y
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Answer:
Step-by-step explanation:
4x² + 25y² + 20xy = (2x + 5y)²
10x + 25y = 5(2x + 5y)
4x² + 25y² + 20xy - 10x - 25y =
= (2x + 5y)² - 5(2x + 5y)
= (2x + 5y)(2x + 5y - 5)
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