If that's - 11x - 20, the answer is (4x + 5)(x - 4). If that's + 11x + 20, it gets ugly in a hurry.
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x2 = -11x - 10 x2 + 11x + 10 = 0 (x + 1)(x + 10) = 0
If you mean x2+11x+24 then it is (x+3)(x+8) when factored
(3x + 1)(x - 4)
(2x - 3)(2x + 3)(4x2 + 9)
Assuming the missing signs are pluses, that factors to (2x + 5)(2x + 5)