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### Parabola - Merit

Mahobe

- Find the intercepts by putting x = 0 and y = 0
- Y-intercept is (0, -15)
- X-intercepts are (5, 0) and (-3, 0)
- The line of symmetry is half way between these points at x = 1 and y = -16

- Find the intercepts by putting x = 0 and y = 0
- Y-intercept is (0, -15)
- X-intercepts are (5, 0) and (-3, 0)
- The line of symmetry is half way between these points at x = 1 and y = -16

- Note that this is just
- Moved down 3

Sketch the following graphs with their axis of symmetry and give the coordinates of the vertex

Vertex (3.5, give the coordinates of the vertex-6.25)

Vertex (-4, -36) give the coordinates of the vertex

Vertex (1, -36) give the coordinates of the vertex

Vertex (1.5 give the coordinates of the vertex, -2.25)

A is (0, -6) or if the diagram is give the coordinates of the vertexto scale (1, -4)

B (-3, 0) give the coordinates of the vertex

C give the coordinates of the vertex (2, 0)

D (-0.5, 0) give the coordinates of the vertex

E give the coordinates of the vertex (-0.5, -6.25)

A stone is fired from a catapult. The height gained by the stone is given by the equation

- h= height of the stone
- t = time in seconds
- At what times is the stone at a height of 25 metres?

Use the calculator to solve and round to appropriate level: stone is given by the equation

What is the stone’s height after 2.5 seconds? stone is given by the equation

Use the calculator to solve and round to appropriate level: stone is given by the equation

Owen and Becks are playing football. Owen receives a pass and quickly kicks the ball towards Becks. The graph below shows the path of the ball as it travels from Owen to Becks. The graph has the equation

Find the value of the y-intercept and explain what this value represents.

Halfway between 5 and -1 is 2. Substitute x = 2. the height is 0.9 metres above the ground.

The graphs of y = -x and y = x(x + 2) are shown. Write down the co-ordinates of A and B.

The graphs of y = -x and y = x(x + 2) are shown. Write down the co-ordinates of A and B.

A(-3, 3)

B(-2, 0)

Michael throws a cricket ball. The height of the ball follows the equation: h = 20x – 4x2 where h is the height in metres that the ball reaches and x is the time in seconds that the ball is in the air.

Describe what happens to the ball: What is the greatest height? How long is it in the air?

Michael throws a cricket ball. The height of the ball follows the equation: h = 20x – 4x2 where h is the height in metres that the ball reaches and x is the time in seconds that the ball is in the air.

Maximum height is 25 metres and the ball is in the air for 5 seconds.

A theme park roller-coaster ride includes a parabolic shaped drop into a tunnel from a height of 45 metres. This drop can be modelled by y = x2 – 14x +45. Draw the graph.

Where does the bottom of the drop occur? drop into a tunnel from a height of 45

The bottom of the drop is at 7 drop into a tunnel from a height of 45 metres.

How many drop into a tunnel from a height of 45 metres does the roller-coaster drop from top to bottom?

From 45 to -4. A height of 49 drop into a tunnel from a height of 45 metres.

Write x drop into a tunnel from a height of 45 2 -14x + 45 in perfect square form.

Write x drop into a tunnel from a height of 45 2 -14x + 45 in perfect square form.

Find the equation of the following parabolas. drop into a tunnel from a height of 45

Don’t forget the stretch drop into a tunnel from a height of 45

Gyn drop into a tunnel from a height of 45 cannot reach the ball as he can only reach to a height of 2.7 m

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