QMI1500
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QMI1500
Elementary Quantitative Methods
Department of Decision Sciences
Assignment questions, Semester 1 2022
Assignment: 02
Due date: 14 March 2022
Unique number: 746467
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ASSIGNMENT 02
Study material: Topics 2.3 - 4.4 in the Study Guide
Unique assignment number: 746467
FIXED DUE DATE: 14 March 2022
Important:
• This is a multiple-choice assignment that must be answered and submitted ONLINE.
• Always keep your detailed workings in a file to be able to compare your solutions to the ones that will
be published on the QMI1500 module site after the due date. Also, keep a copy of the options
you have chosen, in case of a query.
• The due date of this assignment is fixed. No extension can be granted because the solutions will be
posted on the QMI1500 module site shortly after the closing date.
Question 1
The equations of three quadratic functions are given below:
(i) y = 2x2 + 12x + 18
(ii) y = −3x2 − 5x + 3
(iii) y = x2 + 2x − 5
Determine the discriminant of each function and the number of x-intercepts that the parabola has. Choose
the correct sentence. The function described in
[1] (i) has no discriminant and the parabola has no x-intercepts
[2] (ii) has a negative discriminant and the parabola has two x-intercepts
[3] (i) has a zero discriminant and the parabola has one x-intercept
[4] (iii) has a positive discriminant and the parabola has one x-intercept
2
nn
QMI1500
Elementary Quantitative Methods
Department of Decision Sciences
Assignment questions, Semester 1 2022
Assignment: 02
Due date: 14 March 2022
Unique number: 746467
, l
ASSIGNMENT 02
Study material: Topics 2.3 - 4.4 in the Study Guide
Unique assignment number: 746467
FIXED DUE DATE: 14 March 2022
Important:
• This is a multiple-choice assignment that must be answered and submitted ONLINE.
• Always keep your detailed workings in a file to be able to compare your solutions to the ones that will
be published on the QMI1500 module site after the due date. Also, keep a copy of the options
you have chosen, in case of a query.
• The due date of this assignment is fixed. No extension can be granted because the solutions will be
posted on the QMI1500 module site shortly after the closing date.
Question 1
The equations of three quadratic functions are given below:
(i) y = 2x2 + 12x + 18
(ii) y = −3x2 − 5x + 3
(iii) y = x2 + 2x − 5
Determine the discriminant of each function and the number of x-intercepts that the parabola has. Choose
the correct sentence. The function described in
[1] (i) has no discriminant and the parabola has no x-intercepts
[2] (ii) has a negative discriminant and the parabola has two x-intercepts
[3] (i) has a zero discriminant and the parabola has one x-intercept
[4] (iii) has a positive discriminant and the parabola has one x-intercept
2
