Factors are multiplied, not added. The question needs to be something like, "Which two factors of thirty add up to 11?" The answer would then be 5 and 6.
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X2 + 10X - 11 = 0What two factors of - 11 add up to 10 ?(X - 1)(X + 11)==========X = 1X = - 11
-273
No.
143
20