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Carrotsticks your answer is correct (according to the Cambridge 2U textbook) but I can't find what's wrong in my working: u = x u' = 1 v = (4-9x^4)^4 v' = 4(4-9x^4)^3 multiplied by -36x^3 = -144x^3(4-9x^4)^3 y' = (4-9x^4)^4 -144x^4(4-9x^4)^3 y' = (4-9x^4)^3 (4-153x^4) Is the answer in the...

Thanks Carrotsticks! Another question: Differentiate x(4-9x^4)^4

Differentiate y = a(x+b)2 - 8, then find a and b if the parabola has tangent y=2x at the point P(4,8). Full working please. Thanks!

If you sub in a negative number e.g. -2 you get the opposite i.e. 2...so it cant be a. also doesn't the square root of a^2 = |a|?

Expand and simplify square root of {(a-5)(a+5)+25}. The answer says 'a' but why isn't the answer the absolute value of a?

Rust is not a decomposition reaction. It's a synthesis reaction (X+Y-->XY)

- equipment: filter paper, newspaper, cardboard, scissors, silver nitrate, sodium halides (sodium chloride, sodium bromide, sodium iodide etc.), petri dishes, sodium thiosulfate - safety issues: hand may come in contact with the silver nitrate, paper cut, cutting yourself with scissors. -...

Thanks. I haven't learnt the double angle formula yet. So with these questions do you just have to force them into (90-theta), (180-theta), (180+theta), (360-theta)?

How do you simplify: 1) sin(270-theta) 2) cos(90+theta) 3) tan(theta-180) Full working please. Thank You!

when's the geography HSC exam?

empirical formula is the formula of a compound that states the ratio of the atoms/ions present in it (used for ionic compounds e.g. NaCl - for every 1 Na there is 1 Cl ion in the lattice)

- copper is used in electrical wiring in households due to its high electrical conductivity - aluminium is used as a construction material because it is strong, durable, lightweight - tungsten is used in the filament in light bulbs because it's light, ductile and conducts electricity

^good. now post a question

magnetism is suitable for separating the iron filings (because it is the only substance that is magnetic in the mixture) filtration is suitable as it can be used to extract the sand (due to differences in particle size) evaporation can be used to evaporate the water and thus extract the sugar...

Ionic substances are insulators when solid because of the ions are held together by electrostatic forces and thus there is an absence of mobile charge carriers. But when they are in the molten state, the ionic bonds are partially broken, meaning that there are mobile charge carriers and it is...

more energy required for electrolysis because you have to break the strong intramolecular forces (and its a chemical change) whereas weak energy required for boiling because you only need to break the weak intermolecular forces (and its a physical change) Identify a situation where gravimetric...

Could someone please send me the 2009 Syd Gram 2U Maths trial please?

- decomposition is a reaction in which a compound is broken down into two or more simpler substances. It is an intake of energy. - heat: heating copper carbonate to produce copper oxide and carbon dioxide - light: photolysis (decomposition by light) of silver bromide - electricity: electrolysis...

Thanks! I've already got those notes though. They're not that great for pracs though which was what I was primarily looking for.

Does anybody know where I can find some good dot point notes for physics online (theory + pracs)? I've already searched through the resources section.