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Shouldn't it be something like this though? P(x) = c(x-1)(x+2)(ax+b) Because we don't know the coefficient of the whole polynomial?

How would you do this? $Find a polynomial equation of degree 3 such that two zeros are $x=1$ and $x=-2$ and also $P(-1)=4$ and $P(2)=28

Where did you get \left( -\frac{3t}{5}\right) \left(\frac{2t}{5}\right)^{\frac{2}{3}} +q =0 from?

How would you do this? $The polynomial equation $x^5-tx^2+q=0$ where $t$ and $q$ are constants, has a multiple root. Show that $108t^5=3125q^3

No worries, thanks for your help. Although, I might ask again, what exactly is a reference cell? I've never come across the term before.

That's exactly what I thought. To me, there is not enough information to complete the question. I was hoping someone else on this site would approach it differently, and point out something I'm missing. For a), I drew a diagram of a cell which would run of the first reaction it gave us. Is that...

https://www.docdroid.net/2NkbVqF/200420syd20grammar20trial20questionspdf.pdf.html Above is a linked segment of a chemistry trial paper. The section pertains to galvanic cells. I am having particular trouble with question c, the one about constructing a table of standard potentials on page 2. If...

rote, rote, and more rote. I signed up for it though.

That really sucks haha, I'd better get to it. Thanks heaps guys.

Thanks, I didn't realise that it was an isomer... :mad3:

Sigh.... Do I need to memorise the solubility table? I don't think it is on the data sheet.

http://i.imgur.com/6Iw5vro.png Also, how would you work out this?

http://i.imgur.com/VjeFFez.png Why is this c? How would you even work it out?

This is a screenshot from an answer sheet of a James Ruse paper. Apparently, the correct answer is B (bolded), but I believe the correct answer is A. Could someone explain why B is correct?

How would you do this? $P(x) is a monic polynomial of degree 4 with integer coefficients and constant term 3. One zero is i, another zero is rational and the sum of the zeros is negative. Factorise P(x) fully over \mathbb{R}.$

Are you saying that this calculator is incorrect? http://www.calculatorsoup.com/calculators/algebra/squareroots.php

Why is the graph y=\sqrt{(x+1)(x-1)} only above the x-axis? Shouldn't this have a mirror reflection below the x-axis? For example, the square root of 25 is 5, but also -5. Why is this not in the graph?

Cheers mate.

In future, how can I avoid this?

$Find the general solution to $\tan\theta =\sin 2\theta. My answer: \tan\theta = \sin 2\theta\\\frac{\sin\theta}{\cos\theta}=2\sin\theta\cos\theta\\\frac{1}{\cos\theta}=2\cos\theta\\1=2\cos^2\theta\\\cos\theta = \frac{1}{\pm \sqrt{2}}\\\theta = \frac{\pm n \pi}{4}$ where $n\in \mathbb{Z}...