Ellmeister Posted September 13, 2007 Share Posted September 13, 2007 You forgot the -1 x +1 =] HAHA you edited as I was replying Good to know I can still do surds. Link to comment Share on other sites More sharing options...
The fish Posted September 13, 2007 Share Posted September 13, 2007 1! but I'm probably wrong Not in my book, you ain't. You forgot the -1 x +1 =] No, I really didn't... Link to comment Share on other sites More sharing options...
Strider Posted September 13, 2007 Share Posted September 13, 2007 Thanks guys Link to comment Share on other sites More sharing options...
The fish Posted September 13, 2007 Share Posted September 13, 2007 Thanks guys No problem. And anyway, in regards of interest-level, surd's > geography essay. Link to comment Share on other sites More sharing options...
Ellmeister Posted September 13, 2007 Share Posted September 13, 2007 I was wondering has anyone had the A2 General Studies coursework to do? I find it relatively essay to just waffle on, but a limit of 1000 words :| I can't even get all the main points through =[ Link to comment Share on other sites More sharing options...
Zell Posted September 13, 2007 Share Posted September 13, 2007 Remember it's just the difference between two squares, saves you having to do pointless calculations. a^2 - b^2 = (a + b)(a - b) Link to comment Share on other sites More sharing options...
The fish Posted September 13, 2007 Share Posted September 13, 2007 Remember it's just the difference between two squares, saves you having to do pointless calculations. a^2 - b^2 = (a + b)(a - b) Aye, I thought of that too, but I might as well give the full explanation, eh? Link to comment Share on other sites More sharing options...
Supergrunch Posted September 13, 2007 Share Posted September 13, 2007 Ah, surds. You probably won't forget once you've learnt them, which can't be said for a lot of maths. Anyway, feel free to send science and maths this way... I need something to do before university. Link to comment Share on other sites More sharing options...
Ginger_Chris Posted September 13, 2007 Share Posted September 13, 2007 Ah, surds. You probably won't forget once you've learnt them, which can't be said for a lot of maths. Anyway, feel free to send science and maths this way... I need something to do before university. What he said. Link to comment Share on other sites More sharing options...
Fruitgun Posted September 16, 2007 Share Posted September 16, 2007 Heya, I once again return to this thread.. yay! I'm doing my R.E. homework which I hate doing, and I'm fairly stuck on this statement and what to write; C) Explain why Catholics believe evil and suffering exists. Now, I know the basis, people were given free will by God, so they can do what they want, but I don't know how to elaborate on it, and any other points! Any help will be appreciated. Thanks in advance Link to comment Share on other sites More sharing options...
Shino Posted September 16, 2007 Share Posted September 16, 2007 How about because it does? Or if you mean hell, it exists as a way to control the masses. Link to comment Share on other sites More sharing options...
The fish Posted September 16, 2007 Share Posted September 16, 2007 C) Explain why Catholics believe evil and suffering exists. I'd better not answer that... Link to comment Share on other sites More sharing options...
Fresh Posted September 16, 2007 Share Posted September 16, 2007 *Has happily drank away all reminiscences of A-level maths* Link to comment Share on other sites More sharing options...
DanielTimothy Posted September 16, 2007 Share Posted September 16, 2007 How does the Media create audiences? 1000 word essay in my first week of college. Link to comment Share on other sites More sharing options...
Strider Posted September 19, 2007 Share Posted September 19, 2007 Maths stuff again: "Write down the gradient of the straight line and the intersection of the y axis" 5X+2Y=7 Yaaaaaarrrr Link to comment Share on other sites More sharing options...
Ellmeister Posted September 19, 2007 Share Posted September 19, 2007 Maths stuff again: "Write down the gradient of the straight line and the intersection of the y axis" 5X+2Y=7 Well for the intersection, this is when X=0, therefore the X is taken out of the equation. Then it goes 2y=7, therefore y=3.5 Now this is embarassing, but I can't remeber how to work out the gradient from this. Its there on the tip of my tongue but I can't quite remember it. Someone put me out of my misery and answer him Link to comment Share on other sites More sharing options...
Strider Posted September 19, 2007 Share Posted September 19, 2007 Well for the intersection, this is when X=0, therefore the X is taken out of the equation. Then it goes 2y=7, therefore y=3.5 Now this is embarassing, but I can't remeber how to work out the gradient from this. Its there on the tip of my tongue but I can't quite remember it. Someone put me out of my misery and answer him Thanks it was more of a check really. I was positive i was wrong, but i got 3.5 aswell. For the gradient i got 2.5 (Being the 5 before the x devided by 2) Link to comment Share on other sites More sharing options...
Ellmeister Posted September 19, 2007 Share Posted September 19, 2007 Thanks it was more of a check really. I was positive i was wrong, but i got 3.5 aswell. For the gradient i got 2.5 (Being the 5 before the x devided by 2) Ah, so all you do is rearrange it. Can't believe I thought there was something more complicated you had to do >_< Well no-one will want me to help again xD Link to comment Share on other sites More sharing options...
The fish Posted September 19, 2007 Share Posted September 19, 2007 Maths stuff again: "Write down the gradient of the straight line and the intersection of the y axis" 5X+2Y=7 Yaaaaaarrrr For gradient: 2Y = 7 - 5X Y = (7-5X)/2 The gradient is the co-efficient of X, therefore Grad. = -5/2 Link to comment Share on other sites More sharing options...
thirtynine. Posted September 19, 2007 Share Posted September 19, 2007 How does the Media create audiences? 1000 word essay in my first week of college. That is a horrible question. And I dont really know what it means, my first instinct would be to say advertising etc. but im not sure as the question is worded so bloody openly. Link to comment Share on other sites More sharing options...
Supergrunch Posted September 20, 2007 Share Posted September 20, 2007 For the lines thing: All straight lines can be rearranged into the form y = mx + c. This is a useful form because m is the gradient of the line and c is the y intersect. This stands to reason if you compare it with the line y = x: y = x is stretched in the y direction by m and translated by c in the y direction. Link to comment Share on other sites More sharing options...
Calza Posted September 20, 2007 Share Posted September 20, 2007 Functions - Drawing graphs I'm kinda stuck with these as I can't remember how to do them (duh). Draw the graph of y =f(x) for the following functions. On the same diagran draw the graph of the inverse function f^-1 (x). (a) f(x) = 3x + 2 (b) f(x) = x^3 - 3 Link to comment Share on other sites More sharing options...
Supergrunch Posted September 20, 2007 Share Posted September 20, 2007 Functions - Drawing graphs I'm kinda stuck with these as I can't remember how to do them (duh). Draw the graph of y =f(x) for the following functions. On the same diagran draw the graph of the inverse function f^-1 (x). (a) f(x) = 3x + 2 (b) f(x) = x^3 - 3 First of, there is an easy way to find the inverse of a function: change the f(x) to a y, then make all ys xs and all xs ys. Now rearrange for y and replace with f^-1(x). f^-1(x) should be a reflection of f(x) in the line y = x, so if this is indeed the case then you'll know that you're right. (a) This follows y = mx + c, as I was talking about earlier, so it's a straight line with gradient 3 and y intercept 2. For the inverse: x = 3y + 2 y = x/3 - 2/3 f^-1(x) = x/3 - 2/3 So it is a straight line with gradient 1/3 and y intercept -2/3. (b) This curve is a transformation of x^3, which is a curve with a single turning point (inflection on the origin) and a gradient which is always greater than 0. The -3 translates the curve by -3 in the y direction. As for the inverse: x = y^3 - 3 y = cuberoot(x + 3) f^-1(x) = cuberoot(x + 3) So this is the curve cuberoot(x) translated by -3 in the x direction. (note this funtion only has an inverse where x > -3) Link to comment Share on other sites More sharing options...
stuwii Posted September 24, 2007 Share Posted September 24, 2007 How do you factorise 2x squared +3x+1 Link to comment Share on other sites More sharing options...
Ellmeister Posted September 24, 2007 Share Posted September 24, 2007 You bring the 2x into the bracket, and an x into another. So its (2x..)(x...) Then you figure out what times together makes 1 and added/subtracted altogether makes 3. Here it is (2x+1)(x+1), if someone knows how to explain better, feel free :p Link to comment Share on other sites More sharing options...
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