SAT I 一日一问：2014年11月19日
来源：CollegeBoard
2014-11-19 09:30
Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
y = (negative 2 times x^2) + (b times x) + 5
In the xy-plane, the graph of the equation above assumes its maximum value at x = 2. What is the value of b?
(A) negative 8
(B) negative 4
(C) 4
(D) 8
(E) 10
