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If both the roots of a quadratic equatio...

If both the roots of a quadratic equation are coincident, which one of the following is not correct?

A

`x^2-2sqrt(c)x+c=0`

B

`x^2+2kx+k^2=0`

C

`x^2-2bx-b^2=0`

D

`x^2-2kx+k^2=0`

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Knowledge Check

  • If the roots of a quadratic equation are unequal, which one of the following cannot be true?

    A
    A)`Dgt0`
    B
    B)`Dlt0`
    C
    C)D = 0
    D
    D)Roots are conjugate also

  • If 3//2 and 4 are the two roots of a quadratic equation, .then which one of the following is not the correct quadratic equation?

    A
    `2x^2-11xxx+12=0`
    B
    `6x^2-33xxx+18=0`
    C
    `-10xx^2-55xx-30=0`
    D
    `4x^2-41xx+24=0`

  • If the two roots of a quadratic equation are (-3)/2 and (-5)/3 which one of the following is the concerned quadratic equation?

    A
    `6x^2+19x+15`
    B
    `199x+6x^2+15`
    C
    `30x^2+95x+75`
    D
    both (a) and (c)

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