Question: (a) graph each quadratic function by determining whether its graph opens up or down and by finding its vertex, axis of symmetry, y-intercept, and x-intercepts,

(a) graph each quadratic function by determining whether its graph opens up or down and by finding its vertex, axis of symmetry, y-intercept, and x-intercepts, if any. 

(b) Determine the domain and the range of the function. 

(c) Determine where the function is increasing and where it is decreasing.

f(x) = -x2 - 6x

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