Please help solve these three simple releated to graphs ques

Solution

19. Looking at the graph of f(x) : x varies from -ve infinity to +ve infinity.

Domain : ( - infinity, infinity )

Range: y value remains constant at y=-3 .Range y = -3

20 . Domain : All real values of x i.e.

Domain : ( -infinity, infinity)

Range : Vertex of parabola at y= 5 and graph extends below y=5

So, range [ 5, - infinity )

21 a) f(3) = -3 as graph is horizontal axis

b) g(-2)

Looking at graph at x=-2 graph crosses the x axis .So, f(-2) =0