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Find the values of k for …

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Find the values of k for which x²-kx+4=0

    • Posted by Deepika Chowdary 2 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 3 answers

    Preeti Dabral 2 years, 11 months ago

    To find the value of k

    sol: A quadratic equation has equal real roots if the discriminant b2−4ac=0

    x2−kx+4=0 is of form ax2+bx+c=0

    ∴a=1,b=−k,c=4

    Hence the discriminant is 

    (−k)2−4(1)(4)=0⟹k2−16=0⟹k2=16

    Therefore, k=±4

    1Thank You

    Nikita Yadav 2 years, 11 months ago

    4

    0Thank You

    Jatin Bansal 2 years, 11 months ago

    4

    1Thank You

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