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Math Question Help.  
User currently offlineFritzi From United Arab Emirates, joined Jun 2001, 2762 posts, RR: 2
Posted (11 years 2 months 3 weeks 3 days 15 hours ago) and read 1053 times:

A friend of mine asked me if I could help her with a few math questions but my brain doesnt seem to be working very well after last night.

Could someone help me with the anwers to the following questions?

Thanks in advance!

Factor:

t^2-2t+(3/4)

Solve for x:

x^4-13x^2+36=0



7 replies: All unread, jump to last
 
User currently offlineBobrayner From United Kingdom, joined Apr 2003, 2227 posts, RR: 6
Reply 1, posted (11 years 2 months 3 weeks 3 days 14 hours ago) and read 1044 times:

1.
x = 1.5 or 0.5

2.
This is just a straightforward quadratic too!
Imagine x²=y; then solve y²-13y+36=0. It boils down to y=4 and y=9.
So, x=2 or x=3.



Cunning linguist
User currently offlineAndreas From Germany, joined Oct 2001, 6104 posts, RR: 31
Reply 2, posted (11 years 2 months 3 weeks 3 days 14 hours ago) and read 1039 times:

Bob, quite obviously you've just found another excuse to prevent yourself from gardening Big grin


I know it's only VfB but I like it!
User currently offlineFritzi From United Arab Emirates, joined Jun 2001, 2762 posts, RR: 2
Reply 3, posted (11 years 2 months 3 weeks 3 days 14 hours ago) and read 1036 times:

Thanks for the help Bob.

I owe you a beer next time you come in Vienna!



Note to self: Stop partying during the weeks!

User currently offlineFritzi From United Arab Emirates, joined Jun 2001, 2762 posts, RR: 2
Reply 4, posted (11 years 2 months 3 weeks 3 days 11 hours ago) and read 1017 times:

Sorry to pester guys you with one more question:

Solve:

(6/x)+3/(x+2) =2


The one who helps will get a beer the next time he/she comes to vienna.

Thanx


User currently offlineJAL777 From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 2 months 3 weeks 3 days 11 hours ago) and read 1013 times:

(6/x) + 3/(x+2) = 2

6(x+2) +3x=2(x+2)(x)

6x + 12 + 3x = 2x^2 + 4x

0=2x^2 - 5x - 12

x=4

x also has another value but I don't feel like figuring that one out right now.

[Edited 2003-10-01 15:28:13]

User currently offlineAvi From Israel, joined Sep 2001, 943 posts, RR: 6
Reply 6, posted (11 years 2 months 3 weeks 3 days 11 hours ago) and read 1006 times:

Solved by Bobrayner:

2.
This is just a straightforward quadratic too!
Imagine x²=y; then solve y²-13y+36=0. It boils down to y=4 and y=9.
So, x=2 or x=3.


If x²=y and y=4 or y=9 than x=2, x=-2, x=3 and x=-3!!!



Long live the B747
User currently offlineBobrayner From United Kingdom, joined Apr 2003, 2227 posts, RR: 6
Reply 7, posted (11 years 2 months 3 weeks 3 days 11 hours ago) and read 1004 times:

ok, modulo x and modulo y  Smile/happy/getting dizzy


Cunning linguist
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