Express in the form . Hence, sketch the graph of on the axes below. Indicate the turning point and any axial intercepts clearly.
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Worked solution
2(a)
1. Complete the square and simplify the remaining constant.
2(b)
1. Use the completed-square form to identify the turning point and shape of the parabola.
From part (a),
Since the coefficient of is positive, the graph opens upwards.
Turning point: .
2. Find and state the axial intercepts, then describe the required sketch.
For the -intercept, put :
So the -intercept is .
For the -intercepts, put :
This has no real solution since , so for all real .
Therefore, the graph lies above the -axis and has no -intercepts.
Sketch an upward-opening parabola with turning point , crossing the -axis at , and with no -intercepts.
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