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Multiple choice

If one zero of the quadratic polynomial $2x^2 - (3k + 1)x - 9$ is negative of the other find the value of 'k'.

  1. $-\dfrac{1}{6}$
  2. $3$
  3. $\dfrac{1}{4}$
  4. $-\dfrac{1}{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If roots are alpha and -alpha, their sum is 0. Sum of roots = -b/a = (3k+1)/2 = 0. So 3k+1 = 0, k = -1/3.

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