5a(a+2b+b²)
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5(a2-3)
5a2 + 6ab=a(5a+6b)
5a^2 - 5a - 60 ---- 5(a2 + a - 12)
It is: 5a2
Combine like terms, adding/subtracting the coefficients: (5a² + 6a + 2) + (7a² - 7a + 5) = (5+7)a² + (6-7)a + (2+5) = 12a² - a + 7 (5a² + 6a + 2) - (7a² - 7a + 5) = (5a² + 6a + 2) + (-7a² + 7a - 5) = (5-7)a² + (6+7)a + (2-5) = -2a² + 13a - 3