Sketch the graph of y=−(x−2)2+4y=-(x-2)^2+4 on the axes below. Indicate clearly the coordinates of the points where the graph crosses the axes and the maximum point on the curve.

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Worked solution

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1. Identify the maximum point and shape of the parabola

The graph is given in completed-square form:
y=−(x−2)2+4.y=-(x-2)^2+4.
Since the coefficient of (x−2)2(x-2)^2 is negative, the parabola opens downwards.

The maximum point is
(2,4).(2,4).

2. Find the intercepts with the axes

For the yy-intercept, put x=0x=0:
y=−(0−2)2+4=−4+4=0.y=-(0-2)^2+4=-4+4=0.
So the graph crosses the yy-axis at (0,0)(0,0).

For the xx-intercepts, put y=0y=0:
0=−(x−2)2+40=-(x-2)^2+4
(x−2)2=4(x-2)^2=4
x−2=±2x-2=\pm 2
x=0 or x=4.x=0 \text{ or } x=4.
So the graph crosses the xx-axis at (0,0)(0,0) and (4,0)(4,0).

3. Sketch and label the required graph clearly

Draw a smooth downward-opening parabola through (0,0)(0,0) and (4,0)(4,0), with its highest point at (2,4)(2,4).

Label the intercepts and maximum point clearly:
(0,0),(4,0),(2,4).(0,0),\quad (4,0),\quad (2,4).

Answer

Sketch a downward-opening parabola with maximum point (2,4)(2,4), crossing the axes at (0,0)(0,0) and (4,0)(4,0).

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