a² + 2ab + 1 = (a+1)²
m³ - n³ = (m - n)(m² + mn + n²)
25 - a² = 5² - a² = (5 - a)(5 + a)
y² + 10y + 25 = (y + 5)²
-4,5ay - 9by = -4,5y(a + 2b)
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a² + 2ab + 1 = (a+1)²
m³ - n³ = (m - n)(m² + mn + n²)
25 - a² = 5² - a² = (5 - a)(5 + a)
y² + 10y + 25 = (y + 5)²
-4,5ay - 9by = -4,5y(a + 2b)