Question 20
The graph of f (x)=x²+bx+c is tangent to the horizontal axis at (r,0). Which of the following must equal b?
Original printed choices: A) r; B) 2r; C) ±√c; D) bc/r; E) c/r
Editorial note: Explain whether the printed question and choices are consistent. Give the literal mathematical result and distinguish any intended correction.
Original printed choices: A) r; B) 2r; C) ±√c; D) bc/r; E) c/r
Editorial note: Explain whether the printed question and choices are consistent. Give the literal mathematical result and distinguish any intended correction.