SAT I 一日一问：2015年1月20日

Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

In the xy -plane, the graph of the line with equation y equals a intersects the graph of the quadratic function (f times x) equals x^2 minus (6 times x) plus 8 in exactly one point. What is the value of a?

(A) negative 3

(B) negative 1

(C) 1

(D) 3

(E) 4 

正确答案>>>