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He has a typo in the circle locus Q; I think it should read SP=ST.

K I see it now soz @anthonygonzal

All I see at the moment is "Can anyone clarify Q11 A) marking.... i stupidly expanded the whole thing out."...Idk I've been having some display issues lately I'll use my phone.

Nah my internal rank is too bad :/.

Friend asked me this:

Let u= x +\frac{2}{x} \text{ }(1), which gives a quadratic. Solve quadratic for u, then sub that into (1) to find the values of x for which the equation holds.

Haters </3 I'm sure you do ;). To answer thread Q: I think I got 70, checked Carrot's solutions and couldn't find anything wrong.

Could also sub in arbitrary values of a and b I think.

Where is the 0 \leq x \leq 70 option?? D:

Top of page for me, try refreshing?

I reckon it's fine if that means anything =).

st8 rank right there

try integrating, you will see that the amplitude is not 5.

Haha 'A pattern is emerging'.

No.

Is this 'other method' braintic's solution or subbing coordinates directly into the equation of the circle/showing SQ=a?

Ah, I see what you mean. I still doubt it though because if they wanted you to say that I think they would've asked something like 'describe the locus' to fk people over. But then again, the test was pretty easy so they'll need to discriminate..

Well, that implies it so I doubt it.

Had a quick look through, could only spot the product rule error.

97-99 I think