Question

What are the values of k that make 2x^2+kx+5?

A) 7 or 11

B) 2 or 5

C) 1 or 10

D) 1 or 5

Answer 1

Answer: (A)

Solution: Determinant >= 0

=> k^2 - 4.2.5>= 0
=> k^2>= 40
=> k= 7 or 11