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Deepak Bora
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Asked: 2020-07-30T21:33:31+05:30 In:

The value(s) of k for which the quadratic equation 2x² + Kx + 2 = 0 has equal roots, is

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CBSE 10th Class Mathematics

Past year question paper

Year 2020

SET 1, Code Number  – 30/2/1

Question Number –  4

Quadratic equation
real roots

cbse class 10thlast year paperncert class 10th
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    1. Newbie

      Real and equal roots

      ∴b² – 4ac = 0

      b=k, a=2, c=2

      ∴k² – 4 × 2 × 2 = 0

      ∴k² – 16 = 0

      ∴k = + 4, – 4

       

       

       

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