Science & Mathematics - 18 January 2007

The book tells me the answer is (a+b)(a-b)(a+2), but I cannot figure out how to get that answer... Every method I try gives me something different.. What am I doing wrong??

First, I tried grouping "a^3+2a^2"-"ab^2-2b^2" which turned into a^2(a+2a)-b(ab-2b) and got (a^2-b)(a+2a)(ab-2b). This is wrong..

So I realized... I could group a^3+ "2a^2-ab^2-2b^2" ...when I move that first 2 to the second 2 I get a^2-ab^2-4b^2... But I get stuck here... What am I doing wrong?!

It might be more clear to read if you write it down, "a^3" is "a to the power 3"

Thank you for your time!

2007-01-18 07:52:30 · 6 answers · asked by Anonymous in Mathematics

What is the process for converting a decimal like this?

2007-01-18 07:51:18 · 14 answers · asked by Wj85 1 in Mathematics

Yesterday I asked a question about what would happen if I fired a bullet on a train traveling near the speed of light. One of the answers I received said that if the train was traveling at 99mph and I fired a bullet at 100mph, I would see the bullet travel at only 1mph. My thought on this is that the answer is flawed because the bullet was already traveling at 99mph before I fired it, the gun added an additional force behind it to make it go 100mph. So the bullet should travel a total of 199mph. So back to my original question of what would happen if I fired a bullet on a train traveling at near speed of light, and the bullet itself traveled at near speed of light. the two speeds total more the the speed of light which is impossible. So each objects speed must total less than the speed of light, making each object highest speed less than half of the speed of light.

2007-01-18 07:51:13 · 7 answers · asked by jedi1josh 5 in Physics

what are the three types of rna and what are their functions?

2007-01-18 07:50:54 · 2 answers · asked by investing1987 3 in Biology

I am ready to go home, but it's five minutes early than when I looked last time.

2007-01-18 07:48:43 · 13 answers · asked by Anonymous in Physics

What name is given to a process such as burning a candle?

2007-01-18 07:48:21 · 6 answers · asked by Sixteen and Oh 5 in Chemistry

what are the three types of RNA and their functions?

2007-01-18 07:48:14 · 3 answers · asked by investing1987 3 in Biology

2007-01-18 07:47:11 · 4 answers · asked by Anonymous in Geography

I thought you already looked.?

2007-01-18 07:46:28 · 14 answers · asked by doorseeker 1 in Astronomy & Space

2007-01-18 07:45:58 · 2 answers · asked by Bill B 1 in Mathematics

2007-01-18 07:44:52 · 27 answers · asked by Anonymous in Astronomy & Space

2007-01-18 07:44:36 · 9 answers · asked by rosecrashers1365 2 in Earth Sciences & Geology

Find the vertex of the parabola y=3(x+1)^2-4. Give your answer by filling in the blacks in the following sentence, where the first blank is the coordinates or the vertex, and the second blank is either the word "highest" or the word "lowest".

The Vertex is ___________, and this point is the ____________ point on the parabola.

2007-01-18 07:44:26 · 3 answers · asked by Bill B 1 in Mathematics

2007-01-18 07:44:05 · 2 answers · asked by sevo 1 in Engineering

I have heard that when trying to define our universe, you need to use more than 3 dimensions. What for? Consider our earth: We can define space for miles and miles in all directions in only 3 dimensions. Wny then do we need other dimensions like time?

Please explain in simple language and with simple examples.

2007-01-18 07:43:53 · 6 answers · asked by JiveSly 4 in Physics

2007-01-18 07:43:45 · 7 answers · asked by peanutbutterismykitten 1 in Biology

2007-01-18 07:43:25 · 3 answers · asked by rosecrashers1365 2 in Earth Sciences & Geology

2007-01-18 07:43:20 · 3 answers · asked by kennychen 2 in Other - Science

I am looking for verifiable alternatives to installing dewatering drains. Any ideas? This is for a very large freeway interchange project.

2007-01-18 07:42:02 · 1 answers · asked by Adam the Engineer 5 in Engineering

The same crackpots were warning that the 2006 hurricane season would bring several Katrina-like storms...wrong again; it was one of the mildest seasons on record.

I choose to think of these incidences as Divine Intervention!

2007-01-18 07:39:36 · 7 answers · asked by Irish Eyes 4 in Weather

got it.? what side.?

2007-01-18 07:39:27 · 8 answers · asked by doorseeker 1 in Astronomy & Space

Is there solid oxygen, solid nitrogen, etc. etc.? If so what's it used for? If not is it because we don't have the technology or is it because the solid form is useless?

2007-01-18 07:38:59 · 4 answers · asked by Anonymous in Chemistry

2007-01-18 07:38:31 · 13 answers · asked by Anonymous in Weather

I need help, I don't remember how to do this?
You can give me the answer if you want, but I still have to show my work, so please help me show my work.

A car leaves the store at a constant rate of 50 miles per hour to New York.
A second car leaves for New York 1 and 3/4 hours later. The second car travels at a constant rate of 75 miles per hour.
How many hours after the second train leaves the shop will it pass the first car?

2007-01-18 07:34:05 · 7 answers · asked by Anonymous in Mathematics

2007-01-18 07:33:28 · 4 answers · asked by mbtafan 3 in Chemistry

2007-01-18 07:32:21 · 18 answers · asked by Wj85 1 in Mathematics

Using the digitis 1, 2, 3, 4, 8, 9, how many 3 digit numbers can be formed that are greater than 400? No repetition of digitis is allowed.

2007-01-18 07:27:37 · 7 answers · asked by Anonymous in Mathematics

2007-01-18 07:26:17 · 10 answers · asked by melissa g 1 in Botany

2007-01-18 07:25:27 · 4 answers · asked by will t 2 in Biology

2007-01-18 07:25:11 · 4 answers · asked by will t 2 in Botany