If one real root of the quadratic equation 81x^2+kx+256=0 is cube of the other root, then a value of k is

JEE Main Mathematics question

If one real root of the quadratic equation is cube of the other root, then a value of is

Answer: (A)

Let the roots be and : the product is , so the real values are . For the sum is

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Question ID VK-014264