24a3 + 81
factor out a 3
3(8a3 + 27)
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It is: x(x+7) when factorized
78 + 79 + 80 + 80 + 81 + 81 = 479
It's a quadratic expression which can't be factorized because its discriminant is less than zero.
If you mean t^2 +11t +10 then it is (t+10)(t+1) when factorized
r2+6r-7 = (r+7)(r-1) when factored