Question

The least integral value of k such that (k - 2)x² + 8x + k + 4 is positive for all real values of x is

(A)  1

(B)  2

(C)  3 

(D)  5

Answer 1

Correct option  (D) 5

⇒ k < −6

or k > 4

⇒ k > 4

⇒ k = 5