Recent content by seanle

hi i meant exercise 4D, question 2e-ii

hi in insight text book, hsc course 2, question 4D, 2e Which average would you use in a wage case if you were the union representative? The answer is mode. Is that because a union representative would only have access to categorical data? Thank you in advance for any answers

let f(x) = e^2 times e^-x. times both sides by e^x. take logs of both sides to get an expression for x. and then exchange x and y to get a inverse function.

with last question i got lne^2-lny for the inverse function

sorry that will just be one.

sorry that will just be one.

sorry that will just be one.

hi if x = e^2-y, the differiate of this is -e^2-y .Then this is dx over dy and dy over dx will be the recripocal of -e^2-x. Times these together and you get -1.

Re: HSC 2013 3U Marathon Thread a = the square root of 8b + 24 for real roots b+3 is more than or equal to zero. So the minimum value of b is -3.

Re: HSC 2013 3U Marathon Thread a^2-4.2(b+3) is greater than or equal to zero for a minimum a^2 = 8b + 24 let a^2 + b^2 = 8b + 24 + b^2 for b+3 = 0 this does give the answer as 9 but why should i let b+ 3 =0 ? is it a critical point?

Re: HSC 2013 3U Marathon Thread hi i tried using the discriminant let it equal zero for a minimum but i got 8 for an answer. thank for your answer.

Re: HSC 2013 3U Marathon Thread hi 2x^2 + ax + b + 3 =0 HAs real roots. Find the miniumum value of a^2 + b^2 Tried this but could not get the right answer. A cambridge extension question from year 11 book for 3 unit

hi has anyone done a question from cambridge year 11 3 unit 2x^2 + ax + b+ 3 = 0 find the minimum value of a^2 + b^2. The equations has real roots. i get 8 ,the answers have 9