Answer:
The answer is (b)
Explanation:
The quadratic formula is (-b±√(b^2-4ac))/2a. Letter choice (b) is x^2 + 4x +6. Since there is no number before x, we can assume it is 1. With this, you just plug the numbers into the letters. a=1, b=4, and c=6. When you do this, you get (-4±√(16-4(1)(6))/2(1). The 16 comes from 4^2. Hope this helps.