Find the domain and range by functions through writing its set notation, interval and illustrating graph.1.f(x)= -x2

Answer 1

it's a downward opening parabola vertex = (0,0)

range is y in the interval (- infinity, 0] or y<0, {y|y<0}

domain is all real numbers, (-infinity,+infinity), {x|x is a real number}, -infinity<x<+infinity