The equation is
.
Quadratic function represents a parabola in the graph.
\Compared to the quadratic function .
.
since then the parabola open upward.
Vertex is .
Axis of symmetry .
Axis of symmetry is .
.
Vertex is .
Find the - intercepts by substituting
in
.
and
.
Find the - intercept by substituting
in
.
.
Graph:
\Draw the coordinate plane.
\Plot the axis of symmetry, vertex and intercepts.
\Connect the plotted points with a smooth curve.
\ \ \ Domain of the quadratic function is all real numbers.
Domain set of is
.
Domain in interval notation .
Range set of is
.
Range in interval notation .
Observe the graph,
is increasing on
and decreasing on
.
Resultants of are shown in the figure below.
Domain in interval notation
and range in interval notation
.
is increasing on
and decreasing on
.