Question

if the quadratic equation x square +kx +9=0 then the value of k is​

Answer 1

Answer:The given quadratic equation is ;

x² - kx + 9 = 0

Clearly , we have ;

a = 1

b = -k

c = 9

We know that ,

The quadratic equation will have equal roots if its discriminant is equal to zero .

=> D = 0

=> (-k)² - 4•1•9 = 0

=> k² - 36 = 0

=> k² = 36

=> k = √36

=> k = ± 6

Hence,

The required values of k are ± 6 .

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Answer 2

Step-by-step explanation:

for real and distinct roots

b^2 - 4ac greater than equal to 0

k^2 - 36 greater than equal to 0

k = + 6 or -6

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