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Q.

For some integer m, the polynomial x32011x+m has the three integer roots a, b, and c. The value of |a|+|b|+|c|  is equal to ___________

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answer is 98.

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Detailed Solution

Starting off like the previous solution, we know that a + b + c = 0 and 
ab + bc + ac = - 2011.
Therefore, c = - b – a.
Substituting,  ab+b(ba)+a(ba)=abb2ababa2=2011.
Factoring the perfect square, we get :  ab(b+a)2=2011or(b+a)2ab=2011.
Therefore, a sum (a + b) squared minus a product (a b) gives 2011.
We can guess and check different a + b’s starting with 45 since  442<2011.
452=2025 therefore ab = 2025 – 2011 = 14.
Since no factors of 14 can sum to 45 (1+ 14 being the largest sum), a + b cannot equal 45.
462=2116 making ab = 105 = 3*5*13.
5* 7+ 3 < 46 and 3 * 5 * 7 > 46 so 46 cannot work either.
We can continue to do this until we reach 49.
492=2401 making ab = 390 = 2 * 3 * 5 * 13.
3 * 13 + 2 * 5 = 49, so one root is 10 and another is 39. The roots sum to zero, so the last root must be – 49.
 |49|+10+39=098

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