If f(x)=x^2/b^2 + 2x + 4, then for each non-zero value of b the function of f(x) is the least when x equals
A. -1 -\sqrt{(1-4b)}
B. -2
C. 0
D. -b^2
E. b-4![]()
A. -1 -\sqrt{(1-4b)}
B. -2
C. 0
D. -b^2
E. b-4