Question

If the sum of the zeroes of the cubic polynomial 4x3−kx2−8x−12 is −34, then the value of ‘k’ is

Answer 1

A cubic polynomial has 3 zeroes.

For convenience instead of alpha, beta, and gamma, I will name them p, q, and r respectively.

From our polynomial, a = 4, b = -k, c = -8 and d= -12

So, p + q + r = -b/a = -(-k)/4 = k/4

Also given: p + q + r = -34

So, k/4 = -34

k = -34 x 4 = -136

Answer 2

Step-by-step explanation:

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