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Question

The coefficient of x in the equation x2 + px + q = 0 was taken as 17 in place of 13, its roots were found to be -2 and -15, The roots of the original equation are


  1. 3, 10

  2. - 5, - 18

  3. - 3, - 10

  4. 18,5


Solution

The correct option is C

- 3, - 10


let the equation (in correctly written form) be x2 + 17x + q = 0. Roots are -2, -15. So 30=q, so correct equation is x2 + 13x + 30 = 0. Hence roots are -3, -10.

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