Chapter 1 Quadratic Equations In One Unknown Worksheet With Answers Page 21
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341
Quadratic Equations in One Unknown
(b)
y
6
2
y = x
+ 5 x + 6
5
4
3
2
1
x
−5
−4
−3
−2
−1
0
(c) The x-intercepts of y = x
+ 5x + 6 are (
2
−2
−3
) and (
).
+ 5x + 6 = 0 are (
2
−2
−3
Therefore, the roots of the equation x
) and (
).
(a) Plot the graph of y = x
− x − 12 from x = −4 to x = 5.
2
5.
[Suggestion: Scale for x-axis is 10 divisions (1 cm) = 1 unit;
scale for y-axis is 10 divisions (1 cm) = 2 units]
− x − 12 = 0 graphically.
2
(b) Hence, solve the equation x
Solution
(a)
−4
−3
−2
−1
x
0
1
2
3
4
5
−6
−10
−12
−12
−10
−6
y
8
0
0
8
21
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