# Maths Problem

• Page

of 1

• Peew971 17 Feb 2013 18:34:13 6,748 posts
Seen 11 hours ago
Registered 11 years ago
 If anyone can help with that, thank you very much I know I need to find the trapezium's area but can't find the length of its sides without just guessing. Any brain around to help?
• grey_matters 17 Feb 2013 18:50:22 4,234 posts
Seen 3 days ago
Registered 11 years ago
 Let x be the longest side, y be the shorter one, and z the width. x + y = 30 x + z = 24 x = 2z (2 widths line up with the long side) So, x = 24 - z (re-arranging the second equation) which means: 2z = 24 - z (because x = 2z) -> z = 8 (and x = 16, y = 14) You can probably do the rest yourself. Edited by grey_matters at 18:53:12 17-02-2013
• Peew971 17 Feb 2013 19:11:54 6,748 posts
Seen 11 hours ago
Registered 11 years ago
 Great! I got those first 2 equations but didn't notice the long side being twice the width so I got stuck there. Thanks a lot
• Deleted user 20 May 2013 21:21:26
 Help! http://i.imgur.com/0sIzcsW.png I'm useless at maths and I need to know how to answer these questions. It is the working I need. (not for me but I can't think of anyone else to run to!) Edited by mowgli at 21:21:45 20-05-2013
• Deleted user 20 May 2013 21:33:17
 Anyone? Wife needs to know for an exam in a couple of days and I'm fucking useless at maths
• chopsen 20 May 2013 21:34:49 19,081 posts
Seen 2 hours ago
Registered 11 years ago
• chopsen 20 May 2013 21:34:57 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 Does that work?
• chopsen 20 May 2013 21:35:42 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 Hah. Awesomes.
• RichieTenenbaum 20 May 2013 21:39:31 2,472 posts
Seen 3 hours ago
Registered 6 years ago
 6) K=-3 (2 squared is 4. Multiply by 3 to get 12. -3 to get -12) 7) (x + 2)^2 -3 (shifted left by 2, down by 3) (it's plus 2 as you need x to be -2 to get back to zero and make y -3) 8) x = -1 max at -1,1
• chopsen 20 May 2013 21:41:12 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 Yeah. But mine's prettier.
• RichieTenenbaum 20 May 2013 21:45:05 2,472 posts
Seen 3 hours ago
Registered 6 years ago
 It is. MUCH.
• RichieTenenbaum 20 May 2013 21:45:58 2,472 posts
Seen 3 hours ago
Registered 6 years ago
 So, can we just type laTex into this forum?
• X201 20 May 2013 21:48:15 17,655 posts
Seen 4 hours ago
Registered 11 years ago
 RichieTenenbaum wrote: So, can we just type laTex into this forum? You've never used the search function on here have you?
• chopsen 20 May 2013 21:48:22 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 I went via this website, that coverts latex to a linkable gif: http://www.texify.com/links.php I was tempted to just paste some latex and see what happens, but I thought that might be overestimating poor old craigy
• chopsen 20 May 2013 21:48:41 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 $\sum\limits_{i = 1}^n {X_i^2}$ edit: no Edited by Chopsen at 21:48:52 20-05-2013
• mrpon 20 May 2013 21:51:48 32,644 posts
Seen 3 hours ago
Registered 10 years ago
 RichieTenenbaum wrote: So, can we just type laTex into this forum? Afraid not, google: "mwnin laTex" for the syntax.
• Deleted user 20 May 2013 21:51:56
 Genuine thanks, she says it helps a lot (looks like fucking alien talk to me). She doesn't know how you got the answer for 8 though?
• chopsen 20 May 2013 21:57:12 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 at x = -1, the (x+1)^2 is equal to zero. All other values for x are going to be symmetrical around this. Raising something to the power of 2 "removes" the sign. So the axis of symmetry is x= -1. edit: why do I care? Edited by Chopsen at 22:07:32 20-05-2013
• speedofthepuma 20 May 2013 22:01:47 13,398 posts
Seen 4 days ago
Registered 11 years ago
 I used to know all this. How the hell does it stick in your stupid brain? You must be horribly deficient in some other way Chopsen.
• chopsen 20 May 2013 22:04:06 19,081 posts
Seen 2 hours ago
Registered 11 years ago
 It's only because I am actually doing some maths part time at the moment. I generally can't remember anything from more than a couple of weeks ago unless it's written down otherwise.
• RichieTenenbaum 20 May 2013 22:05:48 2,472 posts
Seen 3 hours ago
Registered 6 years ago
 You need to edit a sign there, Choppo
• RichieTenenbaum 20 May 2013 22:09:46 2,472 posts
Seen 3 hours ago
Registered 6 years ago
 A better way to explain 8 x^2 is symmetrical around 0 (x+1)^2 must be symmetrical around -1. This makes the bracket 0. When x is -1. Then y = 1 + (-1+1)^2 = 1 + (0)^2 = 1
• Deleted user 21 May 2013 08:15:49
 Thanks again, both. She was pulling her hair out and is now able to move on.
• Alastair 21 May 2013 08:36:14 19,710 posts
Seen 4 hours ago
Registered 15 years ago
 I used to just about understand this sort of thing - did Maths A-level but failed it. I managed to work out 6 in my head. 7 I could have done on paper, 8 I would have struggled with.
• robkilpatrick 21 May 2013 13:52:10 2 posts
Seen 4 years ago
Registered 4 years ago