# Thread: VCE Maths questions help

1. ## Re: maths questions help

Originally Posted by He-Mann
In my experience, it's either a lack of knowledge in a topic or it requires a whole new perspective on a concept.

Assume that I've understood the question and have enough knowledge in the relevant topics. Then I usually employ a systematic approach described by George Polya in his book How to Solve It:

1. First principle: Understand the problem

2. Second principle: Devise a plan

3. Third principle: Carry out the plan

4. Fourth principle: Review/extend

Works well in my experience when you don't have solutions. But I used to have a habit of checking solutions (given that I had solutions) before giving 100% on it; missed out on mental development here :P
would you check worked solutions or non worked solutions?

2. ## Re: maths questions help

Originally Posted by boredsatan
would you check worked solutions or non worked solutions?
Worked solutions.

3. ## Re: VCE Maths questions help

Is it concerning if I need to use worked solutions to do maths homework? (I have tutor as well)

Bump!!

5. ## Re: VCE Maths questions help

What does the domain R- mean?

6. ## Re: VCE Maths questions help

Originally Posted by boredsatan
What does the domain R- mean?
Probably the negative reals. What was the context?

7. ## Re: VCE Maths questions help

Originally Posted by InteGrand
Probably the negative reals. What was the context?
to sketch the graph of y = 2-x^2, x belongs to R-

8. ## Re: VCE Maths questions help

Originally Posted by boredsatan
to sketch the graph of y = 2-x^2, x belongs to R-
Yeah, so it means sketch it for x < 0.

9. ## Re: VCE Maths questions help

Originally Posted by InteGrand
Yeah, so it means sketch it for x < 0.
so basically sketch just the left hand side of the parabola?

10. ## Re: VCE Maths questions help

Originally Posted by InteGrand
Yeah, so it means sketch it for x < 0.
So R- means <0?

11. ## Re: VCE Maths questions help

Originally Posted by boredsatan
So R- means <0?
Bump!

12. ## Re: VCE Maths questions help

What's the difference between open and closed brackets?

13. ## Re: VCE Maths questions help

Originally Posted by boredsatan
What's the difference between open and closed brackets?
$\noindent For interval notation, an open bracket means you exclude that endpoint and a closed bracket means you include that endpoint. For example, if x is in (3, 4], this means that 3< x \leq 4.$

14. ## Re: VCE Maths questions help

Originally Posted by InteGrand
$\noindent For interval notation, an open bracket means you exclude that endpoint and a closed bracket means you include that endpoint. For example, if x is in (3, 4], this means that 3< x \leq 4.$
How about when stating the domain and range. How do you find out if it's open or closed?

15. ## Re: VCE Maths questions help

Originally Posted by boredsatan
How about when stating the domain and range. How do you find out if it's open or closed?
bump!
How do you know weather to state the domain with open or close brackets?

16. ## Re: VCE Maths questions help

Originally Posted by boredsatan
bump!
How do you know weather to state the domain with open or close brackets?
Depends on whether the domain includes the endpoint or not.

17. ## Re: VCE Maths questions help

Originally Posted by InteGrand
Depends on whether the domain includes the endpoint or not.
Some questions ask you to state the domain and range of a graph. How do you know weather to state it as open or closed?

18. ## Re: VCE Maths questions help

Originally Posted by boredsatan
Some questions ask you to state the domain and range of a graph. How do you know weather to state it as open or closed?
If they give you the graph, you can look at it to see if an endpoint is included or not.

19. ## Re: VCE Maths questions help

Originally Posted by InteGrand
If they give you the graph, you can look at it to see if an endpoint is included or not.
So if it was a parabola that had arrows going in each direction would it be infinity and open bracket?

20. ## Re: VCE Maths questions help

Originally Posted by boredsatan
So if it was a parabola that had arrows going in each direction would it be infinity and open bracket?
$\noindent It would be (-\infty, \infty). In other words, \mathbb{R}.$

21. ## Re: VCE Maths questions help

Originally Posted by InteGrand
$\noindent It would be (-\infty, \infty). In other words, \mathbb{R}.$
Is this for the domain or the range?

22. ## Re: VCE Maths questions help

Originally Posted by boredsatan
Is this for the domain or the range?
Domain

23. ## Re: VCE Maths questions help

Originally Posted by InteGrand
Domain
so the range would be (lowest y value, infinity)?

24. ## Re: VCE Maths questions help

What is the domain and range of y = 3/(x+2)^2 + 2?

25. ## Re: VCE Maths questions help

Originally Posted by boredsatan
What is the domain and range of y = 3/(x+2)^2 + 2?
Anyone?

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