Which of the following must be true about b?
Mathematics
In the xyplane, the graph of the function f(x) = x^{2} + bx + 4 does not intersect the xaxis. Which of the following must be true about b?

A. −8 ≤ b < −4

B. b = −4

C.−4 < b < 4

D.b = 4

E. 4 < b ≤ 8
I would need a comprehensive explanation on how you arrived at your answer so I’ll know how to it the next time around. Thanks!