Question

if the discriminant of 2x²-kx-4=0 is 64 then find the value of k?​

Answer 1

Answer:

Given quadratic equation- 2x² - kx - 4 = 0

Here, a = 2, b = -k and c = -4

To find- Value of k

We know that, D = b² - 4ac

Substituting the values, we get,

64 = (-k)² - 4 × 2 × -4

k² = 64 - 32

k² = 32

k = ± √32

k = ± 4√2

∴ k = ± 4√2

Answer 2

Step-by-step explanation:

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