Mathematics - 14 October 2007

Ok how do u show the equation x^3-cos^2x=0 has the root in [0,2]??????

and given that f(x)=x^4-x^2+5x+2, show that there exists at least two real numbers x such that f(x)=3.

2007-10-14 23:59:15 · 2 answers · asked by Mike M 1

thanks!

2007-10-14 23:42:03 · 10 answers · asked by hellllloooooooo 1

a. 5x = 6

b. 12x =6

c. 12x - 7 = 6

d. 12x - 24 = 6

thanks!

2007-10-14 23:31:33 · 10 answers · asked by dandelion 1

a. -14

b. -4

c. 4

d. 14

thanks!

2007-10-14 23:22:13 · 7 answers · asked by dandelion 1

a. -15

b. -10

c. 10

d. 15

2007-10-14 23:21:03 · 11 answers · asked by dandelion 1

Hey just a little complex number job I'm stuck on:

By putting z in the form x + iy and using l z l (modulus) = square root(x^2 + y^2), Find the cartesian equation of the region defined by:

(modulus) l z - (2 + 3i) l = 4

2007-10-14 22:43:04 · 3 answers · asked by trussell_47 1

I'm stuck on a question about induction:

Can you prove by 'strong' induction that for every integer n > 2 either n or (n -1) is a sum of distinct primes.

I think it might be to do with the fact that for every integer n > 3, there is a prime p such that n/2 < p < n.

Am I along the right lines/?

2007-10-14 22:39:11 · 2 answers · asked by THJE 3

2007-10-14 22:38:24 · 6 answers · asked by The O 1

2007-10-14 22:32:26 · 32 answers · asked by monkeynuts 4

2007-10-14 22:13:31 · 26 answers · asked by John P 1

Please help me. I don't know how to work it out

2007-10-14 22:07:28 · 6 answers · asked by Maximus 5

2007-10-14 21:38:07 · 6 answers · asked by SOPHIE T 1

You and a friend share teh driving on a 280 mile trip. Your average speed is 58 miles per hour. your friend's average speed is 53 miles per hour. You drive one hour longer than your friend. How many hours did each of you drive?

2007-10-14 21:26:58 · 8 answers · asked by Anonymous

if z=3-4i
w= 1+3i
write z/w in polar form

2007-10-14 21:22:54 · 7 answers · asked by mikemallow 1

Suppose the average blink of an eye takes one twentieth of a second and you blink 10 times per minute. If you travel at an average speed of 90 km/h for 4 hours, how many kilometres will you travel with your eyes closed......

Before anyone asks is not homework!! im sick of people askin

2007-10-14 21:17:16 · 2 answers · asked by crazy_foz51 2

Answer is not :-
6 , 5, 6^6 , 6! , (6!)^2 , 5!

2007-10-14 21:09:02 · 7 answers · asked by Anonymous

ive drawn like a billion diagrams to model this situation but it still doesnt help. and NO, this not hw. it IS in my math textbook but im doing it as practice and not to get good grades...and hopefully you all believe me.

anyways:
two miles upstream from his starting point, a canoeist passed a log floating in the rivers current. After paddling upstream for one more hour, he finally paddled back and reached his starting point just as the log arrived. Find the speed of the current.

the part i get screwed up at is when i have to take into consideration the guy going "upsteam" so against the current which will obviously affect his speed. and downstream which will make him go faster.

oh and please show me how to solve it STEP BY STEP so i acutally KNOW how to do it.

2007-10-14 20:38:42 · 8 answers · asked by <3pirate 6

2007-10-14 20:29:50 · 3 answers · asked by hua_alexander 2

Maria has twice as much money as Paul.
Paul has $8 more than Rocky.
Together they have $104.
How much does each have?

Help by showing step by step.

Paul:$28 Maria: $56 Rocky: $20

2007-10-14 20:20:53 · 5 answers · asked by persevere 2

What is the circumference of a circle with a diameter of 4?
What is the area of a circle with a diameter of 4?

2007-10-14 20:08:28 · 8 answers · asked by Sweet*Angel 3

I have no idea what in the world I'm doing.
I've missed math twice during the lecture on this, so I'm confused as to what I'm supposed to be looking for, since the book barely gives an explanation.

Somehow this: x^3-x^2+x-1 = (x-1)(x-i)(x+i)

I really want to know the whole process as to how to go about this. I've looked up and down this website already, and I see everything about roots. Would I need to find the roots to factor these?

Here are two problems from my homework that I must factor:

x^2+x+2

x^3+6x^2+11x+6

I don't even know where to start. :(
Someone please help me and guide me through this process. I have a test over this at the end of the week, and I really want to know how to do this.

Thank you soo much. :]
...If someone helps me. :(

2007-10-14 19:42:34 · 6 answers · asked by tovtovtov 2

find the equation of the line that passes through th points (-2,-4) and (2,-1)

2007-10-14 19:39:36 · 8 answers · asked by carlos t 1

half angle.

2007-10-14 19:36:29 · 3 answers · asked by candy 3

you know the one with the 3 dots like a pyramid........

2007-10-14 19:36:03 · 2 answers · asked by Anonymous

Two consecutive positive integers have a product of 7832. Find the numbers.

2007-10-14 19:31:34 · 7 answers · asked by Anonymous

do not use caculus to solve, and what values of a and b give the maximum product.

2007-10-14 19:25:35 · 7 answers · asked by ac213 1

2007-10-14 19:23:23 · 1 answers · asked by aviator 1

Last one and I'm done!

Please help me one last time!

(36a^2b^7) / (6a^21b^2) Write in simplest form.

2007-10-14 19:22:16 · 5 answers · asked by Anonymous

2007-10-14 19:20:46 · 6 answers · asked by i<3WL 2

A quadratic function with roots 4/5 and 4/3 would be:

A) y = 15x^2 + 8x - 16
B) y = 15x^2 - 32x + 16
C) y = 15x^2 + 32x + 16
D) y = 15x^2 - 8x - 16

2007-10-14 19:19:52 · 4 answers · asked by Anonymous