|
Post by Alex on Jan 9, 2007 14:29:56 GMT -1
Can anyone help me? Doing a resit in maths tomorrow and just doing a bit of revision. Anyone able to explain it? The expression (1+2x) 4 can be written in the form 1 + px + qx 2 - 32x 3 +16x 4By using the binomial expansion, or otherwise, find the values of the integers p and q.
|
|
|
Post by Mrs H on Jan 9, 2007 14:33:00 GMT -1
... you put your left leg in, your left leg out, in out, in out, shake it all about, you do the hokey cokey and you turn around, that's what it's all about! Hope that helped Alex.
|
|
|
Post by Alex on Jan 9, 2007 14:35:03 GMT -1
If only i could do that in the exam.....
|
|
gt
Non League Player (someone crap, like Boston)
Posts: 51
|
Post by gt on Jan 9, 2007 14:35:34 GMT -1
I'm scared of maths
|
|
|
Post by Mrs H on Jan 9, 2007 14:37:06 GMT -1
I'm scared of maths I agree. Maths is an evil tool.
|
|
|
Post by Alex on Jan 9, 2007 14:38:24 GMT -1
My only concern is when am i ever going to need that in regular life?
|
|
gt
Non League Player (someone crap, like Boston)
Posts: 51
|
Post by gt on Jan 9, 2007 14:38:52 GMT -1
I'm scared of maths I agree. Maths is an evil tool. I have nightmares about being chased across a meadow by a rabid quadratic equations, or drowning in a soup of vulgar fractions!
|
|
|
Post by Mrs H on Jan 9, 2007 14:40:56 GMT -1
My only concern is when am i ever going to need that in regular life? When you're attacked by giant equalateral triangles Alex. Pythagoras suffered it throughout his short and frazzled life.
|
|
gt
Non League Player (someone crap, like Boston)
Posts: 51
|
Post by gt on Jan 9, 2007 14:40:57 GMT -1
My only concern is when am i ever going to need that in regular life? Maths GSCE mock exams we had to calculate the area left as a basketball passes through a hoop and my mate wrote ‘What a fucking stupid question, this has no relevance to real life’ and BOY did he pay for that ;D On a serious note sorry I can’t help Alex But good luck with it
|
|
|
Post by Mrs H on Jan 9, 2007 14:44:24 GMT -1
|
|
|
Post by Neko Bazu on Jan 9, 2007 14:49:29 GMT -1
I can tell you that even having done an HNC in Mechancial Engineering (ridiculous equations by the bucketful!), I've still not had any use for those in real life. Much like Geography, I think you'll only ever use it again if you become a maths teacher!
|
|
|
Post by HURLOCK on Jan 9, 2007 14:52:00 GMT -1
I'm scared of maths I really don't know how I passed my o/level maths (GCSE equivalent) But yes tis an evil subject, hail the trusty calculator!
|
|
|
Post by Mrs H on Jan 9, 2007 14:52:55 GMT -1
I can tell you that even having done an HNC in Mechancial Engineering (ridiculous equations by the bucketful!), I've still not had any use for those in real life. Much like Geography, I think you'll only ever use it again if you become a maths teacher! Geography is surely useful otherwise you wouldn't know what country you are in. Although if I think back to my Geography lessons with Mr William "Willy" Fogg (I kid you not!) all we learned about was contours and the fact that Mr Fogg could put a leg behind his head whilst standing up!
|
|
|
Post by Neko Bazu on Jan 9, 2007 14:55:18 GMT -1
I can tell you that even having done an HNC in Mechancial Engineering (ridiculous equations by the bucketful!), I've still not had any use for those in real life. Much like Geography, I think you'll only ever use it again if you become a maths teacher! Geography is surely useful otherwise you wouldn't know what country you are in. Although if I think back to my Geography lessons with Mr William "Willy" Fogg (I kid you not!) all we learned about was contours and the fact that Mr Fogg could put a leg behind his head whilst standing up! Nah, you just need to ask local types where you are. If they can't understand you, you know you're fucked! I can't honestly remember one useful thing from my geography lessons that I didn't already know (Like map-reading :
|
|
|
Post by Rulesaints on Jan 9, 2007 15:08:34 GMT -1
Where's KH when you need him?
|
|
|
Post by Pete the Wolf on Jan 9, 2007 16:13:09 GMT -1
(1+2x) 4 = [(1+2x)²]², using the rule that when you've got two powers, on different sides of a bracket, they need to be multiplied. The (1+2x)² becomes 1+4x+4x² You then multiply (1+4x+4x²) x (1+4x+4x²) That needs to be done multiplying one of the brackets by the individual parts of the other, so youre doing: 1 x (1+4x+4x²) 4x x (1+4x+4x²) 4x² x (1+4x+4x²) Add these up to get an answer of 1 + 8x + 20x²+ 32x³ + 16x 4So p = 8 and q = 20
|
|
|
Post by Tony Yeboah's Lunchbox on Jan 9, 2007 16:14:37 GMT -1
Pete i'm not even gonna bother trying to understand that but it looks good so i'll exalt you
|
|
|
Post by Alex on Jan 9, 2007 16:14:58 GMT -1
That is fecking superb Pete! Thank you so much! Exaltarooed with pleasure
|
|
|
Post by Lollipop on Jan 9, 2007 16:15:54 GMT -1
(1+2x) 4 = [(1+2x)²]², using the rule that when you've got two powers, on different sides of a bracket, they need to be multiplied. The (1+2x)² becomes 1+4x+4x² You then multiply (1+4x+4x²) x (1+4x+4x²) That needs to be done multiplying one of the brackets by the individual parts of the other, so youre doing: 1 x (1+4x+4x²) 4x x (1+4x+4x²) 4x² x (1+4x+4x²) Add these up to get an answer of 1 + 8x + 20x²+ 32x³ + 16x 4So p = 8 and q = 20 Yeah, Alex. What he said.
|
|
|
Post by Pete the Wolf on Jan 9, 2007 16:19:10 GMT -1
I long to see maths like that again in my exams. I've got an exam worth 11.6666666.......% of my year on the 20th and barely understand any of it. Oh, and exalts will be returned shortly
|
|