# The figure shows the graph of y = x2 + 4x + c

```Shatin Pui Ying College
F.4 Mathematics
Test Ch.2: Functions and Graphs
Name: __________________
Date:________________
Class/ Class No.:___________
Marks:___________/50
Section A (4 marks @)
1. The figure shows the graph of y = x2 + 4x + c. Which of the following is a possible value of c?
A.
B.
4
5
C.
D.
4
0
2.
It is given that f(x) = 4x2 – 8x + 12. Which of the following must be true?
I.
II.
III.
A.
B.
C.
D.
The minimum value of f(x) is 12.
The axis of symmetry of the graph of y = f(x) is x = 1.
The coordinates of the vertex of the graph is (1, 8).
I and II only
I and III only
II and III only
I, II and III
3.
The figure shows the graph of y = x2 + 5x. Solve -x2 +5x6&lt;0.
A.
B.
2&lt;x&lt;3
x &lt; 2 or x &gt; 3
C.
D.
1 &lt; x &lt; 6
x &lt; 1 or x &gt; 6
4.
In the figure, the graph of y = g(x) is obtained by translating the graph of y = 2x2 – 2x + 4
downwards. Which of the following is the symbolic representation of g(x)?
A.
B.
C.
D.
g(x) = 2x2 – 2x + 7
g(x) = 2x2 – 2x + 1
g(x) = 2x2 + 10x + 16
g(x) = 2x2 – 14x + 28
1
5.
If f(x) = x2  7x  4 is transformed to g(x) = x2  7x + 4, find the symbolic relation between f(x)
and g(x).
A.
B.
g(x) = f(x)  8
g(x) = f(x) + 8
C.
D.
g(x) = f(x  8)
g(x) = f(x + 8)
Section B
1. The figure shows the graph of y = x2 + bx + c which cuts the x-axis at A(–6, 0) and B(1, 0).
Find the values of b and c.
(5 marks)
2.
Hence, solve x 2  5 x  6  0 graphically.
(2 marks)
The figure shows the graph of y = –x2 – 2x + 1.
(5 marks)
(a) Solve (x – 1)2 + 4x &lt; 0 graphically.
(b) Find the largest integer x that satisfies –x(x + 2)  –4.
3.
It is given that f(x) = x2 + 5, g(x) = f(x) – 8 and h(x) = g(x + 2).
(a) (i)
(8 marks)
Describe the effect of the transformation on the graph of y = f(x) when f(x) is transformed
to g(x).
2
(ii) Find the symbolic representation of g(x).
(b) (i)
Describe the effect of the transformation on the graph of y = g(x) when g(x) is
transformed to h(x).
(ii) Find the symbolic representation of h(x).
4.
In the figure, a rectangular picture ABCD of perimeter 160 cm is hung by a piece of rope AED
at the peg E, where AE = ED. It is given that the shortest distance between the peg and the
picture is 15 cm. (Hint: Let one side of the rectangular picture be x cm)
(a) Find the maximum area of the picture.
(6 marks)
(b) Find the length of the rope when the area of the picture is maximum.
(4 marks)
3
```
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