# Search results

1. ### UNSW Subject Reviews.

Hey guys what do you reckon are the easiest 3 business economics courses to complete a business economics minor? I have some space left in my degree and wanna fill it up with chill subjects, preferably WAM boosters. I also have space for one WAM booster in a faculty other than Business...
2. ### technique identification help

If you find these quotes useful in your writing, you don't always have to identify the specific techniques that they utilise, you just need to describe the effect, because in essays, markers are mostly looking for your ability to find and then critically and insightfully analyse texts in light...
3. ### Rocket Thrust Question

For this one, you don't apply Lenz's Law - at least not in my approach. In fact, you apply the Left Hand Curl Rule (LHCR). As the CRO shows a wavy voltage (not a straight line), you can deduce that this is AC and not DC. So you can eliminate A and C because they have a split ring commutator...
4. ### MATH1251 Questions HELP

Could you use something like this?
5. ### MATH1251 Questions HELP

Thanks for clarifying! This time from Algebra: Parts (b) and (c) of this one please
6. ### Selective schools outcome letter

I guess if it doesn't say anything about a priority reserve list in the letter, then unfortunately he didn't make it. :( However, I don't know that much about Hurlstone's selection process: ask him to contact the school/look at their website and see if they say anything about priority reserve...
7. ### MATH1251 Questions HELP

(a) Using the notation in the suggestion provided, I get a'(x) = 1-2x and b'(x) = 2y. If I then set these to equal 0, I get x = 1/2 and y = 0. I also used parts of my original approach to determine the other critical points. However, none of these provide the maximum value that is provided in...
8. ### MATH1251 Questions HELP

Thanks! Could you please demonstrate how one would go about doing these by solving these using the shortcuts you've provided?

bump
10. ### MATH1251 Questions HELP

\\\text{(a) Find the maximum and minimum values of }f(x,y) = x-x^2+y^2\text{ on the rectangle }\\0 \leq x \leq 3, 0 \leq y \leq 2.\\\text{(b) Find the maximum and minimum values of }f(x,y) = xy(1-x-y)\text{ on the triangle with vertices (0,0), (2,0), (0,2).}
11. ### MATH1251 Questions HELP

Thanks for clarifying that seanieg89. I misinterpreted that by intercepts they meant the actual points (in vector form) where the plane cuts the x, y and z axes. But yeah I realised that now thanks to your response :D
12. ### MATH1251 Questions HELP

Yeah got it thanks. For this one I get sum of intercepts of the plane as \sqrt{a} (\sqrt{x_0}, \sqrt{y_0}, \sqrt{z_0})^T. And this doesn't count as independent from P, does it?
13. ### MATH1251 Questions HELP

Thanks. Yeah figured out the integral bit lol Had another question: I found the tangent to be: 2p(x-p) + 2q(x-q) - (p^2+q^2)(z+p^2+q^2) = 0 Now for the bit where it asks to find where it cuts the z-axis, do I set x = y = 0? I did that and I get z= 0, so the only place where the axis is cut...
14. ### MATH1251 Questions HELP

Ohh right thanks!
15. ### MATH1251 Questions HELP

Thanks, but why isn't the f(x_0) part included?
16. ### MATH1251 Questions HELP

Also, is this right?
17. ### MATH1251 Questions HELP

Part (c) (only) for this one please:
18. ### MATH1251 Questions HELP

How'd you do part (d) and (e) of this question?
19. ### MATH1251 Questions HELP

Yes, I'm pretty sure this incorporates the total differential approximation in computing the tangent plane equation to the graph of f. Notice the upside down triangle in the equation, that's the total differential approximation we're computing. It's the same as the tangent line you're used to...
20. ### MATH1251 Questions HELP

I don't think it says it's safe to assume that for this question.... Here's the proper screenshot: