The sum of roots of the equation (x+1)(x+2) + (x+3)(x+4) + (x+5)(x+6) +…. (x+9)(x+10) = 0 is

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-11

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-55

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Solution

The correct option is B
-11

the eqn is 5x2 + x (1+2+3+4……10) + (1.2+3.4+5.6+7.8+9.10) = 0. Sum of roots = - $\frac{b}{a}$

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