Menu
Home / Arithmetic Aptitude / Quadratic Equations :: Discussion

Discussion :: Quadratic Equations

  1. Find the value of a/b + b/a, if a and b are the roots of the quadratic equation x2 + 8x + 4 = 0?
    2. A.
    15
    B.
    14
    C.
    24
    D.
    26
    E.
    None of these

    View Answer

    Workspace

    View Answer

    Answer : Option B

    Explanation :

    a/b + b/a = (a2 + b2)/ab = (a2 + b2 + a + b)/ab
    = [(a + b)2 - 2ab]/ab
    a + b = -8/1 = -8
    ab = 4/1 = 4
    Hence a/b + b/a = [(-8)2 - 2(4)]/4 = 56/4 = 14.

Write your comments here:

Be The First To Comment