a^3+3a^2+3a-7 I need to factorise this plz help me
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a^3 + 3a^2 + 3a - 7
= a^3 + 4a^2 + 7a - a^2 - 4a - 7
= a(a + 4a + 7) - 1(a+ 4a + 7)
= (a + 1)(a + 4a + 7)
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