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21x^(2) - 28x + 10=0...

`21x^(2) - 28x + 10=0`

Text Solution

Verified by Experts

The correct Answer is:
`2/3 +- sqrt(14)/21 i`
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Knowledge Check

  • If 3 - sqrt(2) is a root of x^(4) - 8x^(3) + 21x^(2) - 26x + 14 = 0 then the roots are

    A
    `1 pm sqrt(2), 1 pm i`
    B
    `-1 pm sqrt(2), - 1 pm i`
    C
    `3 pm sqrt(2), 1 pm i`
    D
    `-3 pm sqrt(2), -1 pm i`

  • The roots of x^(4) - 10x^(3) + 26x^(2) - 10x + 1 = 0 are

    A
    `3 pm 2 sqrt(2), 2 pm sqrt(3) `
    B
    `2 pm 3 sqrt(2), 2 pm sqrt(3) `
    C
    `3 pm 2 sqrt(2), 3 pm sqrt(2)`
    D
    `2 pm 3 sqrt(2) , 3 pm sqrt(2)`

  • The conic represented by 2x^(2) -12xy +23y^(2) -4x -28y -48 =0 is

    A
    parabola
    B
    ellipse
    C
    hyperbola
    D
    none

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    If the roots of x^4 -2x^3 - 21x^2 + 22 x + 40 =0 are in A.P then the roots are

    The equation of the circle passing through the origin and the points of intersection of the two circles x^(2) + y^(2) - 4x - 6y - 3 = 0 , x^(2) + y^(2) + 4x - 2y = 0 " is " x^(2) + y^(2) - 28x - 18y = 0

    Solve x^(2) - 10x + 21 lt 0 by algebric method and graphical method.

    Solve x^(2) - 4x - 21 ge 0 by algebric method and graphical method.

    The equation of the common tangent at the point contact of the circles x^(2) + y^(2) - 10x + 2y + 10 = 0 , x^(2) + y^(2) - 4x - 6y + 12 = 0 is

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