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Date November 2014 Marks available 4 Reference code 14N.1.sl.TZ0.14
Level SL only Paper 1 Time zone TZ0
Command term Draw and Find Question number 14 Adapted from N/A

Question

The axis of symmetry of the graph of a quadratic function has the equation x \( =  - \frac{1}{2}\)

.

Draw the axis of symmetry on the following axes.

The graph of the quadratic function intersects the x-axis at the point N(2, 0) . There is a second point, M, at which the graph of the quadratic function intersects the x-axis.

[1]
a.

Draw the axis of symmetry on the following axes.

[1]
a.

The graph of the quadratic function intersects the \(x\)-axis at the point \({\text{N}}(2, 0)\). There is a second point, \({\text{M}}\), at which the graph of the quadratic function intersects the \(x\)-axis.

Clearly mark and label point \({\text{M}}\) on the axes.

[1]
b.

(i)     Find the value of \(b\) and the value of \(c\).

(ii)     Draw the graph of the function on the axes.

[4]
c.

Markscheme

vertical straight line which may be dotted passing through \(\left( { - \frac{1}{2},{\text{ }}0} \right)\)     (A1)     (C1)

a.

vertical straight line which may be dotted passing through \(\left( { - \frac{1}{2},{\text{ }}0} \right)\)     (A1)     (C1)

a.

point \({\text{M }}( - 3,{\text{ }}0)\) correctly marked on the \(x\)-axis     (A1)(ft)     (C1)

Note: Follow through from part (a).

b.

(i)     \(b = 1\), \(c = - 6\)     (A1)(ft)(A1)(ft)

Notes: Follow through from (b).

 

(ii)     smooth parabola passing through \({\text{M}}\) and \({\text{N}}\)     (A1)(ft)

Note: Follow through from their point \({\text{M}}\) from part (b).

 

parabola passing through \((0,{\text{ }} - 6)\) and symmetrical about \(x = - 0.5\)     (A1)(ft) (C4)

Note: Follow through from part (c)(i).

If parabola is not smooth and not concave up award at most (A1)(A0).

c.

Examiners report

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Syllabus sections

Topic 6 - Mathematical models » 6.3 » Quadratic models.
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