Question

3x^2+kx+81=0 find the value of k in quadratic equation

Answer 1

the question u asked is hard to find because u`ve got 2 unknown variables wich are k and x so i guess i have to tell that inorder to find k we have to know the value of x.

sorry that i couldn`t help u

Answer 2

Answer:

Let, X = 2

P(x)= 3x^2 +kx +81 =0

P(2)= 3(2)^2 +k(2) +81 =0

P(2)= 3(4) +k(2) = -81

P(2)= k(2) = - 81 - 12

P(2)= k = - 91/2

So, k = - 45.5

Hope it helps u

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