Math help

[F9]

Ok people, i will need some help once again, this time for maths!I never solved or seen maths in english, but tomorrow i have to take a test in maths completely in english!Needless to say, i cant even understand what some instructions say, cause i dont know the definitions in english

WTF does rationalize the denominator of the function means?

it gives me( i will use programming shits, cause i dont think i can do it just the way its written)
so (SQRT(x)-1)/(SQRT(x)+1)
how the fuck do i find the solution?
it also gives me 5 possible solutions, which are
a) (x-2*SQRT(x)+1)/(x-1)
b)x-1
c)SQRT(x)/(x-1)
d)x
e)none of the above

there are a couple more, but didnt got there yet, will post them later.

[RED DAVE]

Rationalizing the function basically means getting all the roots out of the denominator (the bottom half of the fraction).

(a) is correct

Here's how it goes:

(SQRT(x)-1)/(SQRT(x)+1)

This can be rewritten as

(x^1/2-1)/(x^1/2+1)

multiply both the numerator and the denominator by (x^1/2-1) or (SQRT(x)-1), which gives you

(x^1/2-1)(x^1/2-1)/(x^1/2+1)(x^1/2-1)
or, in your notation
(SQRT(x)-1)(SQRT(x)-1)/(SQRT(x)+1)(SQRT(x)-1)

This reduces to (x-2x^1/2+1)/(x-1),
which in your notation is:
(x-2*SQRT(x)+1)/(x-1)

(Long time since I taught math.http://www.revleft.com/vb/../revleft/smilies/biggrin.gifhttp://www.revleft.com/vb/../revleft/smilies/biggrin.gifhttp://www.revleft.com/vb/../revleft/smilies/biggrin.gif:D)

RED DAVE

[F9]

oh great thanks!:D
and weird thing is... i got it!:thumbup1::D

[F9]

ok new question. graphs and functions this time.

we have the graph you know the one like the cross, and on that i have a function who has its point(top) at (0,3) and creates a V left and right going up with the y line
What is function?
a)even
b)odd
c)both
d)neither
e) none of the above

:confused::confused:

[Quail]

If the function looks as though it is reflected in the y-axis then it's even:
http://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Function_x%5E2.svg/220px-Function_x%5E2.svg.png

[F9]

its like that, its just "higher", and its not rounded

Ok, thanks, but why its even? :p I need to know that if im going to get it right tomorrow;) also what is odd?

[F9]

heres another one, whats the formula to convert degrees to radians, and the other way around(radians to degrees)?

[Jazzhands]

heres another one, whats the formula to convert degrees to radians, and the other way around(radians to degrees)?

Degrees to radians-multiply by Pi/180.

Radians to degrees is 180/Pi.

[Tjis]

This might be helpful: http://mathworld.wolfram.com/

There you can find out the definitions of mathematical words, formulas, etc.

[¿Que?]

ok new question. graphs and functions this time.

we have the graph you know the one like the cross, and on that i have a function who has its point(top) at (0,3) and creates a V left and right going up with the y line
What is function?
a)even
b)odd
c)both
d)neither
e) none of the above

:confused::confused:

If the function is like what Kayl posted, but not curved, then the y coordinate increases as the absolute value of the x coordinate does. And you will get the same value for y, regardless of whether x is positive or negative. That's all I know as math is not my forte.

[F9]

ok people, mission is officially failed:lol:
Good thing is, i was told that this was to get the good ones to a class with higher level, so yeah, i think i prefer the lower level on maths, they give on my nerves

[Jazzhands]

ok people, mission is officially failed:lol:
Good thing is, i was told that this was to get the good ones to a class with higher level, so yeah, i think i prefer the lower level on maths, they give on my nerves

Hey, this'll cheer you up! Math is my absolute worst subject, and I just got a 99% on a test! :Danyway, this actually helped me learn the stuff by teaching it.

This would be a good thread to sticky...

[Manifesto]

While this is open I might as well get on it.

Solve by whichever method seems easiest. Give both real and imaginary roots. Be sure not to lose or gain roots.

4t=1+15t^2

[Manifesto]

Could really use some help with that to get me started.

[Tjis]

While this is open I might as well get on it.

Solve by whichever method seems easiest. Give both real and imaginary roots. Be sure not to lose or gain roots.

4t=1+15t^2

first bring all terms to the same side
15t^2 - 4t + 1 = 0

Then solve for t using the method described here, keeping in mind that the square root of -1 is i: http://mathworld.wolfram.com/QuadraticEquation.html

[Manifesto]

first bring all terms to the same side
15t^2 - 4t + 1 = 0

Then solve for t using the method described here, keeping in mind that the square root of -1 is i: http://mathworld.wolfram.com/QuadraticEquation.html
Thanks that really helped refresh my memory.

[RED DAVE]

To take a little of the sting away from math, try this by a Marxist historian.

A Concise History of Mathematics - by Dirk Struik (http://books.google.com/books?id=ECkXB-T2mwIC&printsec=frontcover&dq=struik+a+concise+history+of+mathematics&source=bl&ots=2leET_Yoa8&sig=RP20krBhbtj-izeww46VagKrpWI&hl=en&ei=2sOjTK_oIYG78gahldSRCg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCMQ6AEwAg#v=onepage&q&f=false)

(Trivia: Struik lived to 106! (http://en.wikipedia.org/wiki/Dirk_Struik))

RED DAVE

[F9]

ok, maths again, but with a different number system, binary :p

i was having a hard time with this one example, i now think i got it, but i am not sure.I can get the result pretty easily cause its just 4 bits number, but the procedure is the one counts.Its division, the other are pretty simple, i thought this one was too, but when i came to the examples i started finding it difficult..

so... 1001/11 (of course result is 11 or 9/3=3)

__11_
11)1001
x -11
(not possible so i put 0, and move to the next bit)
100
(getting next 0)
- 11
(subtraction is possible so i add 1 to the solution)
0011
(get the next bit, the 1, down)
- 11
(substraction is possible so i add 1 to solution)
0000
The end


Is my "procedure" correct?I know the result is correct, but i have the doubt of my thinking cause i knew the result from before and maybe it just happened to fit to this example.I dont know what was special about this example, i did others and didnt find any problem, but this...:confused: i dont know, maybe its just because i was reading for hours and i had years to do such a thing:lol:

Edit:I hope you get it, i got them perfectly lined, but i always hated the replying system that fucks up the spaces:mad: