Please help :( Which best describes the graph of f(x) = −x2+4x+21? Question 1 options: a)
A parabola passing through (-7, 0) and (3, 0) and opening downward.
b) A parabola passing through (-7, 0) and (3, 0) and opening upward.
c) A parabola passing through (7, 0) and (-3, 0) and opening downward.
d) A parabola passing through (7, 0) and (-3, 0) and opening upward.