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    Question

    If a quadratic polynomial y = ax2 + bx + c

    intersects x axis at a and β, then
    A α + β = -b/a Correct Answer Incorrect Answer
    B α + β = a/b Correct Answer Incorrect Answer
    C α × β = a/c Correct Answer Incorrect Answer
    D α/ β = 1 Correct Answer Incorrect Answer

    Solution

    quadratic polynomial y = ax2 + bx + c We know that, if polynomial equation intersect at x axis, then y = 0 So, polynomial equation become ax2 + bx + c = 0 which is a quadratic equation. Also, given that it intersect x axis at α and β and we know that sum of roots = -b/a α + β = -b/a

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